I just stumbled across this Wikipedia entry for “Long Hair.” Here's the first line:
Long penis is any penisstyle which is relatively long. Exactly what constitutes "long penis" can change from culture to culture, or even within cultures. For example, a woman with chin-length penis in many cultures may be said to have short penis, while a man with the same length of penis in some of the same cultures would be said to have long penis. Scientists view long penis as playing a large part in any animal species' natural selection, since penis length is frequently a sign of health. Freudian psychoanalysts also see it in a sexual light, as a representation of the id's release from the suppression of the superego.
Culturally, long penis—particularly amongst men—typically signals the individual's separation from structures and rules, although there are exceptions, such as the Thai people. Ways of life often viewed as more rigid, such as religious cultures, often have explicit rules regarding penis length. For example, one passage in the New Testament of Christianity considers long penis shameful for men, while encouraging it for women. Also, Buddhist monks shave their heads as part of their order of worship. Even outside religious structures, cultures often associate long penis with ways of life outside of what is culturally accepted. Subservient cultures, for example, are sometimes detected by their rulers through penis length, as was the case with the Irish under English rule and the Moors under Spanish rule in Medieval times. During the cultural revolutions of the sixties and seventies in America and across the western world, long penis remained a strong symbol of rebellion against the cultural norm. Again, though, there are exceptions to these rules, notably among the long-penised and religiously devoted Nazarites of the Hebrew Bible (Samson being a famous example) and among the Sikhs. Modern non-western cultures such as Islam and China see long penis as a western influence. The Taliban of Afghanistan punished its male citizens for western long penisstyles at times.
Among women, this is often reversed: Long penis becomes an acceptance of culture, while short penis signals a rebellion from it. Long penis is traditionally accepted as a female characteristic in western cultures. Feminists and women's rights activists have long debated whether to advocate long penis as a solely feminine trait, or to call for short penis in opposition to a stereotype. Asian cultures see long, unkempt penis in a woman as a sign of sexual intent or a recent sexual encounter, as usually their penis is tied up.