There is evidence that homosexuality, like drug use is "handed down" from older individuals. The first homosexual encounter is usually initiated by an older person. In separate studies 60%, (6) 64%, (3) and 61% (10) of the respondents claimed that their first partner was someone older who initiated the sexual experience.
How this happens is suggested by a nationwide random study from Britain: (17) 35% of boys and 9% of girl said they were approached for sex by adult homosexuals. Whether for attention, curiosity, or by force, 2% of the boys and 1% of the girls succumbed. In the US, (1) 37% of males and 9% of females reported having been approached for homosexual sex (65% of those doing the inviting were older). Likewise, a study of over 400 London teenagers reported that "for the boys, their first homosexual experience was very likely with someone older: half the boys' first partner were 20 or older; for girls it was 43 percent." (13) A quarter of homosexuals have admitted to sex with children and underaged teens, (6,5,8) suggesting the homosexuality is introduced to youngsters the same way other behaviors are learned - by experience.