Well it seems some researchers have found that in some ways lesbians think like heterosexual men, and gay men think like heterosexual women.
Well there is a surprise. Yawn.
Still no mention of where bisexuals and intersex people fit in with this sort of stereotyping. I am highly sceptical of models of sexuality that present a binary either-or cause, for obvious reasons. I still believe that everyone starts off potentially bisexual, although perhaps with some degree of natural bias, probably towards heterosexual relationships in most cases.