Don't Put That in There! by Aaron E. Dr. Carroll, Rachel C. Dr. Vreeman Page A

to one important question: Does it matter how big the guy’s penis is? We will start by looking at whether penis size matters to men who have sex with women, then whether it matters to the women themselves, and then whether it matters to men who have sex with men.
    If you ask your friends, you might hear all kinds of answers to this question. Some claim that size does not matter at all as long as the man knows how to use their penis well. Others swear that the best sex of their lives was with a particularly well-endowed partner. And some will say that sex with an exceptionally large penis was not enjoyable, and even painful. Both popular opinion and surveys suggest that men are very concerned about the question of how big they are and how the size of their penis compares to other men’s penises.
    Scientists have looked at the influence of penis size on all sorts of things—from height and body fat to sexual satisfaction and the risk of having various infections. The studies tell us that penis size does matter, but not necessarily in the ways that you might think.
    A huge Internet survey of more than 50,000 heterosexual men and women investigated penis size and satisfaction. In this survey, most men reported that they had an average-sized penis (66 percent), while 22 percent said their penis was large and 12 percent rated it as small. No actual penis sizes were measured, so this study relied only on what these men said about themselves. (Remember, they might not have the right idea about what an average penis size really is!) About half of the men (55 percent) were satisfied with their penis size, but 45 percent wanted to have a larger penis and 0.2 percent wanted to be smaller. In contrast, 85 percent of women reported being satisfied with their partner’s penis size. This suggests that size is less important to women, or that they are more likely to be satisfied with their partner’s penis size, than he is with his own size.
    In this study, reporting that you had a big penis was linked to other body traits that are generally thought to be good. The self-reported penis size correlated positively with being taller and with having less body fat. The men reporting having larger penises also reported being more attractive. While some people might call that good luck or good genes—whatever it is that makes you both well-endowed and handsome—this finding could also reflect very confident individuals who think that everything about themselves is great, from how handsome they are to how big their penis is. This is one of those unexpected ways in which penis size might matter. How you see your penis might be correlated with how you see the rest of you.
    Other studies have looked at how penis size, body shape, and height might be related to each other. Scientists have wondered whether evolution pushed these traits together because women might have considered all of them when they were considering their mating options. An evolutionary force might be at play if women were making their decisions about who to mate with based on whom they found the most attractive. If women found penis size very attractive, then women might be more likely to pick men with bigger penises, and then humans might be pushed toward having bigger and bigger penises.
    Along these lines, scientists wanted to assess how much penis size plays into women’s ideas about who is attractive. To do this, they set up studies where women evaluate life-sized digital pictures of men of various proportions. It turns out that penis size, body shape, and height are all significant factors in who women think are hot. Increasing penis size in these digital men did increase how often women thought they were attractive, but the effect got smaller and smaller past a certain point. Penis size actually had a stronger effect on attractiveness in taller men than in shorter men, and the same was true for men with a more masculine body shape (which is defined as having wider