Calling All Adaptationists

 
If you need some practice making up just-so stories then get on over to Pharyngula and join the party. The commenters are having a gay old time making up adaptationist explanations for homosexuality [Gay roundup]. If you don't want to make up your own stories then you can vote for your favorite on seyd [Evolution and Homosexuality]. All the tired old standards are there including ...

Likewise, removing a portion of the population from breeding relieves the breeders of some of these costs either directly by assisting with child rearing, or indirectly by taking over other costly activities (like food collection) so that t he parents can spend more resources on their progeny.

Naturally, PZ is not joining in. He doesn't believe that an adaptationist explanation is required. I agree. In fact, I'm not even sure that an evolutionary explanation is needed since the evidence for a heterosexual gene is practically nonexistent. (Note that if there's a gay and/or lesbian allele then there has to be a heterosexual one as well.)