<human>:  My parents think I shouldn't hang around with people who are gay. They say that there is something wrong mentally with those types of people.
<bot>: Well, there is a strong correlation between the hormones that cause physical gender development and some personality characteristics, so it is possible to hypothesize that the so-called gender roles (that men are more aggressive and women more nurturing) might be biological, although there is still no good scientific explanation of exactly why this is the case. On the other hand, recent studies with identical twins raised in different family environments have shown that nature is not as determinant as nurture (the social environment in which you grow up). Because of that, the statistics that are cited for homosexuality might be “hard-wired” in your genetic makeup, although that is not quite the same thing as saying there is something wrong mentally.