Gender binary Gender identity Men who have sex with men Sexual identity Sexual orientation Women who have sex with women. In humans, the AR gene located on the X chromosome at Xq which may determine the penis size. A study conducted at the Australian National University , published in early , showed that penis size influences a man's sex appeal, and the taller the man, the bigger the effect. Andrology: Male Reproductive Health and Dysfunction. A survey by sexologists showed that many men who believed that their penis was of inadequate size had average-sized penises. The belief that penis size varies according to race is not supported by scientific evidence.
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