Reports about possible genetic bases of homoerotic sexual orientation in adults have received a kind of schizophrenic social reception. On the one hand, these reports have been welcomed by some gay men and lesbians as biological confirmation of the commonly held view that sexual orientation is an involuntary trait, that sexual orientation is not in any meaningful sense chosen. Simon LeVay has received mail from thankful correspondents who welcomed his 1991 report about the possible neuroanatomical basis for male homoerotic sexual (...) orientation, and some legal analysts see important implications of biological studies for the ways in which civil rights are recognized, especially those that depend on an immutable characteristic like race or gender. (shrink)