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In some cultures, mass hysteria involving the believed removal or shrinking of the penis has been observed (genital retraction syndrome).

Many beliefs in popular hold that it is possible to predict the size of someone’s penis by observing other features. The features usually selected are the hands the feet, the nose or height. One urban legend suggests that the size of a fully erect penis is the length from the tip of a man’s thumb to the tip of his index finger, when a 90° angle is made with these two digits. (An alternative formulation is that this indicates the flaccid penis’s length.)

The suggested link between penis size, foot size and height has been investigated by a relatively small number of groups. Two of these studies have suggested a link between penis size and foot size, while the most recent report dismissed these findings.

One of the studies suggesting a link relied on the subjects measuring the size of their own penis, which may well be inaccurate. The second study found statistically significant although “weak” correlation between the size of the stretched penis and foot size and height A potential explanation for these observations is that the development of the penis in an embryo is controlled by some of the same Hox genes (in particular HOXA13 and HOXD13) as those that control the development of the limbs. Mutations of some Hox genes that control the growth of limbs cause malformed genitalia (hand–foot–genital syndrome). However the most recent investigation failed to find any evidence for a link between shoe size and stretched penis size. Given the large number of genes which control the development of the human body shape, and the effects of hormones during childhood and adolescence, it would seem unlikely that an accurate prediction of penis size could be made by measuring a different part of the human body.
Other studies correlating the size of the human penis with other factors have given intriguing results. Notably one study analysing the self-reported Kinsey data set found that homosexual men had statistically larger penises than their heterosexual counterparts.

One potential explanation given is a difference in the exposure to androgen hormones in the developing embryo. The study author’s opinion is that evidence points towards both orientations being equally likely to exaggerate.

Recently, there has been greater media attention to the issue of penis size and women being more vocal about their preferences. Television shows such as Sex and the City and Alley McBeal popularised the penis-size issue when characters in these TV shows stated their preference for well-endowed men and rejected men who had only average endowment. In HBO’s Sex and the City a female character is portrayed crying in bed when she experiences her boyfriend’s penis for the first time and discovers that it is below average length, as opposed to the large length she had expected and anticipated.

Surveys of women’s actual preference have consistently shown that penis size is only a priority for a minority of women, and some women dislike large penises. In recent years, penis pumps, pills, and other dubious means of Penis Enlargement have had increased sales.

One source of continued debate is the extent to which heterosexual and bisexual women actually prefer certain penis sizes. In a 2005 UCLA study, 85% of women said they were “very satisfied” with their romantic partner’s size.

A study published in BMC Women’s Health, surveyed women’s preferences concerning penis size and concluded that width rather than length is a more important factor of sexual stimulation.

Another study, conducted at Groningen University Hospital, asked 375 sexually active women (who had recently given birth) the importance of penis size and concluded: “Although clearly in the minority, a nevertheless considerable percentage of the women respondents attached substantial importance to the size of the male sexual organ”.

Penis Health