Sexual intercourse , also called coitus , or copulation , reproductive act in which the male reproductive organ in humans and other higher animals enters the female reproductive tract. If the reproductive act is complete, sperm cells are passed from the male body into the female, in the process fertilizing the female egg and forming a new organism. In some vertebrates, such as fish , eggs are laid outside of the body and fertilized externally. To accomplish internal copulation certain body and organic adaptations are necessary. In the human male, the penis serves both excretory and reproductive functions.
The glans at the head of the penis swells and the testes enlarge in the male; in the female, the outer vagina contracts and the clitoris retracts. Given the small amount of erectile tissue in a bull's penisthere is little enlargement after erection. An upward pointing ;enis is most common. Great sex minus intercourse involves the same leisurely, playful, whole-body caressing that sexuality authorities recommend to lovers of all Flacid penis coitus. Submit Feedback.
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Hunter Wessels, you have to position the tip of the ruler gently against the point where the shaft meets Sussex small engine abdomen. It is used for maintenance of the Wikipedia project and is not part of the encyclopedia. Wellcome M You Flacid penis coitus roll it back and forth in two hands, you can squeeze and release while holding it in your hand, etc. Those traits are unsexy as hell and reach even Flacid penis coitus hard-on slaying heights in the bedroom. Some people, on both ends, find this a unique and pleasurable sensation. Human penis with foreskin retracted. Compilation:- my penis starts off small then I get an erection. Pensi, Styles of Circumcision. By Lyndsie Robinson. Category : Human penis by degree of rigidity. Pay attention Stereotypes cheerleaders what happens as you pet, stroke and tap different parts of the penis and scrotum.
A penile fracture is not the same as a break in a bone.
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- The idea may sound strange, but I guess we've all had at least one alarming episode of impotence: sometimes, after years of reliable service, one's penis suddenly refuses to get hard at the required time!
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An erection clinically: penile erection or penile tumescence is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal or sexual attraction , although erections can also be spontaneous. The shape, angle, and direction of an erection varies considerably in humans. Physiologically, erection is triggered by the parasympathetic division of the autonomic nervous system , causing the levels of nitric oxide a vasodilator to rise in the trabecular arteries and smooth muscle of the penis.
The arteries dilate causing the corpora cavernosa of the penis and to a lesser extent the corpus spongiosum to fill with blood ; simultaneously the ischiocavernosus and bulbospongiosus muscles compress the veins of the corpora cavernosa restricting the egress and circulation of this blood. Erection subsides when parasympathetic activity reduces to baseline. As an autonomic nervous system response, an erection may result from a variety of stimuli, including sexual stimulation and sexual arousal , and is therefore not entirely under conscious control.
Erections during sleep or upon waking up are known as nocturnal penile tumescence NPT. Absence of nocturnal erection is commonly used to distinguish between physical and psychological causes of erectile dysfunction and impotence.
The state of a penis which is partly, but not fully, erect is sometimes known as semi-erection clinically: partial tumescence ; a penis which is not erect is typically referred to as being flaccid, or soft.
An erection occurs when two tubular structures, called the corpora cavernosa , that run the length of the penis, become engorged with venous blood. This may result from any of various physiological stimuli, also known as sexual stimulation and sexual arousal. The corpus spongiosum is a single tubular structure located just below the corpora cavernosa, which contains the urethra , through which urine and semen pass during urination and ejaculation respectively. This may also become slightly engorged with blood, but less so than the corpora cavernosa.
The scrotum may, but not always, become tightened during erection. Generally, the foreskin automatically and gradually retracts, exposing the glans , though some men may have to manually retract their foreskin.
In the presence of mechanical stimulation, erection is initiated by the parasympathetic division of the autonomic nervous system with minimal input from the central nervous system.
Parasympathetic branches extend from the sacral plexus into the arteries supplying the erectile tissue; upon stimulation, these nerve branches release acetylcholine , which in turn causes release of nitric oxide from endothelial cells in the trabecular arteries. The ischiocavernosus and bulbospongiosus muscles also compress the veins of the corpora cavernosa, limiting the venous drainage of blood.
After ejaculation or cessation of stimulation, erection usually subsides, but the time taken may vary depending on the length and thickness of the penis. The cerebral cortex can initiate erection in the absence of direct mechanical stimulation in response to visual, auditory, olfactory, imagined, or tactile stimuli acting through erectile centers in the lumbar and sacral regions of the spinal cord. The penis may erect during sleep or be erect on waking up. Such an erection is medically known as nocturnal penile tumescence informally: morning wood or morning glory.
Erection is a common indicator of sexual arousal and is required for a male to effect vaginal penetration and sexual intercourse. Erections are common for children and infants, and even occur before birth.
An unusual aversion to the erect penis is sometimes referred to as phallophobia. Spontaneous erection, also known as involuntary, random or unwanted erection, is commonplace and a normal part of male physiology. Socially, such erections can be embarrassing if they happen in public or when undesired. The length of the flaccid penis does not necessarily correspond to the length of the penis when it becomes erect; some smaller flaccid penises grow much longer, while some larger flaccid penises grow comparatively less.
Its size may be increased by surgery,  although penile enlargement is controversial, and a majority of men were "not satisfied" with the results, according to one study. In regards to the average size of a human erect penis, a study of 15, men, and the best research to date on the topic, as the subjects were measured by health professionals, rather than self-measured, has concluded that the average length of an erect human penis is Although many erect penises point upwards, it is common and normal for the erect penis to point nearly vertically upwards or nearly vertically downwards or even horizontally straight forward, all depending on the tension of the suspensory ligament that holds it in position.
An erect penis can also take on a number of different shapes, ranging from a straight tube to a tube with a curvature up or down or to the left or right. An increase in penile curvature can be caused by Peyronie's disease. This may cause physical and psychological effects for the affected individual, which could include erectile dysfunction or pain during an erection.
Treatments include oral medication such as colchicine or surgery, which is most often reserved as a last resort. The following table shows how common various erection angles are for a standing male. An upward pointing angle is most common. Erectile dysfunction occurs for a variety of reasons.
Ultimately, the cause for erectile dysfunction is that not enough nitric oxide NO is released by the vascular endothelium of the branches of the perineal artery , a branch of the internal pudendal artery.
Erectile dysfunction may occur due to physiological or psychological reasons, most of which are amenable to treatment. Erectile dysfunction, tied closely as it is to cultural notions of potency , success and masculinity , can have devastating psychological consequences including feelings of shame , loss or inadequacy. Around one in ten men experience recurring impotence problems at some point in their lives.
Priapism is a painful condition in which the penis does not return to its flaccid state, despite the absence of both physical and psychological stimulation. Priapism lasting over four hours is a medical emergency.
At the time of penetration, the canine penis is not erect, and only able to penetrate the female because it includes a narrow bone called the baculum , a feature of most placental mammals. After the male achieves penetration, he will often hold the female tighter and thrust faster, and it is during this time that the male's penis expands. Unlike human sexual intercourse, where the male penis commonly becomes erect before entering the female, canine copulation involves the male first penetrating the female, after which swelling of the penis to erection occurs.
An elephant's penis is S-shaped when fully erect and has a Y-shaped orifice. Given the small amount of erectile tissue in a bull's penis , there is little enlargement after erection. The penis is quite rigid when non-erect, and becomes even more rigid during erection. Protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure. A male fossa's penis reaches to between his forelegs when erect.
The retractor muscle contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath. A bird penis is different in structure from mammal penises , being an erectile expansion of the cloacal wall and being erected by lymph , not blood. Clinically, erection is often known as "penile erection", and the state of being erect, and process of erection, are described as "tumescence" or "penile tumescence".
The term for the subsiding or cessation of an erection is " detumescence ". Colloquially and in slang , erection is known by many informal terms. Commonly encountered English terms include 'stiffy', 'hard-on', 'boner' and 'woody'. From Wikipedia, the free encyclopedia. Physiological phenomenon in which penis becomes firm. This article is about penile erection. For the similar arousal in females, see clitoral erection.
For other uses, see Erection disambiguation. Main article: Nocturnal penile tumescence. Erection visible beneath clothing. Main article: Human penis size.
Main article: Erectile dysfunction. Sexuality portal. Essential Clinical Anatomy, Third Edition. Philadelphia, Encyclopedia of Reproduction. Academic Press. Penis Structure-Erection. Boston, Carroll 29 January Cengage Learning. What's Happening to My Body? Book for Boys: Revised Edition. Newmarket Press. Retrieved 22 July Jessica Kingsley Publishers. Kinsey Institute. Retrieved Fox News. Problems And Solutions. London, Nitric Oxide. BJU Int. Archived from the original on Reece 4 March Functional Anatomy and Physiology of Domestic Animals.
Gillespie; Frank Bennie Flanders 28 January Mammalian Species : 1—5. Retrieved 19 May University of Wisconsin-Madison. Retrieved 7 July The Horse. Sexual Behaviour In Animals.
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Foley catheter protruding from human penis. Foreskin Foreskin cock me. Foreskin covering half the glans. Foreskin covering the glans. Notice how some parts feel firmer and other parts feel squishier. Some people like the feeling of being cupped or contained. Large or small, the nice thing about a soft penis is that it's malleable and easy to fit in one or two hands. Lift and Separate.
A soft penis has a lot more give to it. One way to provide stimulation is not to just rub or stroke it, but to actually move the different parts around. With one hand make a kind of ring shape with your thumb and forefinger and wrap that right around the scrotum.
While holding onto the penis with your other hand, gently tug downwards, away from the shaft of the penis. And again gently, bring both hands away from your partner's body so you are pulling their penis away and apart.
Extend your reach to include the perineum, which is the area between the scrotum and the anus. This is a highly responsive area for most people. You can run your fingers up and down the area, you can use your fingertips to tap, you can also massage the area. In fact, pushing firmly up into the body is a way of providing external prostate stimulation.
Avoid the Up and Down. The long stroking motion that is usually used in a handjob isn't going to do much and probably won't feel very good with a soft penis. Your partner might like more active moments; in that case , experiment with different ways to play with the penis. You can roll it back and forth in two hands, you can squeeze and release while holding it in your hand, etc. Use Lube If you want to use more active stimulation, adding a personal lubricant is probably a good idea.
Lube makes everything slicker, and people often report feeling more sensitive or at least being more aware of stimulation when they are using lubricant. Having said that, playing with a very small penis that's also soft can be more difficult if everything is so slippery.
Some people will prefer the feeling of friction and rubbing, and lube reduces the friction. As with handjobs, much of what you know about oral sex can be applied to your standard soft penis. Unless the penis is soft immediately following an ejaculation or numb from overstimulation, remember that the nerve endings are still there, and the tactile and psychological thrill of being vulnerable can be as intense with a soft penis as it is with an erection. You may have to use your hands more to isolate the shaft or scrotum since a soft penis can kind of fold into itself.
Of course, one benefit of performing fellatio on a soft penis is that with very few exceptions, you don't have to worry about your gag reflex or it being too big. In fact, oral sex with a soft penis provides an opportunity for much more aggressive play without hurting yourself. You can play with suction, either with part or all of your partner's penis in your mouth.
Consider the classic "hummer" move , where you actually hum a tune, thereby creating a pleasant modulated vibration in your mouth. This can be very pleasurable. If your goal is to move from a soft penis to a hard one, you might want to avoid stimulating the perineum or the prostate. Even though both of these can be very pleasurable they can also lead to an erection getting softer or disappearing altogether. Our bodies are capable of producing stimulation in countless ways.
Someone with a soft penis is hardly at a disadvantage if you want that person to make you feel pleasure - that is, unless you insist that the only way you can feel pleasure is with an erection. This goes for the person with the soft penis as well. You can both give and receive pleasure in literally thousands of other ways.
But you need to be open to this and not be stuck on the idea that to feel good or make someone else feel good, you need an erection. Think about that for a bit. What are your favorite ways to be stimulated? Do they all involve an erection or even a penis? For some, the answer will be yes.
Erection - Wikipedia
A recent study published in the British Journal of Urology claims to have finally laid the kibosh on the considerable debate surrounding the average size of the penis. While there have been previous attempts to quantify average penis size, these studies varied considerably in measurement of flaccid and erect state, racial groups, age and whether measurements were conducted by a professional or by the participants themselves who may have felt inclined to fudge the numbers somewhat.
This most recent study from the UK conducted a systematic review of twenty previous studies of penis size which included over 15, men from a diverse range of ages and ethnic groups.
By collating the measurements of these studies, the authors arrived at the all-important figures. Drum roll please… The average erect length of the human male penis is Flaccid length and circumference were reported at 9. The majority of participants in this study were from European and Middle-Eastern nations so there is further confirmatory work to be done with other ethnic groups, but the authors hope that these findings will lay to rest concerns of inadequacy in the vast majority of the population whose penises fall within the 'normal' range.
Why all the hubbub over penis size anyway? All the penis is required to do in a biological sense is deliver sperm into the vagina and the rest is taken care of. A small penis can achieve that, so why are we hung up on size? Humans actually have tremendously large penises compared to closest primate relatives. Even the mighty gorilla is only packing approximately 1. Perplexingly though, humans have small testicles when compared to the great apes.
That human penises are so relatively large indicates some evolutionary selection pressure on larger manhood. What this selection pressure is remains unclear but one obvious possibility is that women want it that way. When it comes to penis size and sex the prevailing assumption, especially amongst men, is that bigger is better. This is not necessarily the case however, with most women emphasising the importance of girth over length when it comes to pleasure during sex.
Another study had females rate 3D computer generated images of upright males with varying flaccid penis sizes. In general, larger penises were preferred but with diminishing returns as penis size increased, suggesting an upper threshold of desirability. The appeal of larger penises was also more pronounced in taller men.
Interestingly however, height and penis size had an almost equal effect in increasing attractiveness. The fact that flaccid penises were used in this study confuses the results, as flaccid penises are a poor indicator of erect size.
In terms of actual sexual pleasure, there is little reason to believe that a larger penis provides a great advantage.
Factors such as length of intercourse and erectile function play a much larger role in female pleasure than penis size. The limited evidence for a relationship between penis size and female pleasure during sex comes from studies of vaginal orgasm.
Two surveys found that women who prefer deeper vaginal stimulation unsurprisingly preferred longer penises. Vaginal orgasms in women tend to be quite rare though, with the majority of women orgasming clitorally. To this end, these same studies found that penis size was unrelated to clitoral orgasm frequency.
Furthermore, extensive clitoral tissue exists beneath the skin on either side of the vagina whose function is poorly understood, but nonetheless may contribute to experiences of vaginal orgasm.
From the limited range of studies conducted on female preference, women seem largely unbothered by penis size and are far more concerned with personality, intelligence, and humour. Women also tend to think that men worry far too much about penis size. His research includes investigating genetic variation in traits related to mate choice such as pathogen disgust and avoidance, mate preferences, and the mental and behavioural aspects of masculinity and femininity.
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