Why is something that obviously should well be evolutionarily wiped out (if it is indeed due to genes/people can't help it) not, by now?
(Corollary question if you say "there is no evolution, it's intelligent design" - ok then what the heck purpose would homosexuality serve in this design? Honest question, I'm not being a smartass.)
Edit - PS you know you're over some kind of target if an OP gets downpoots.
Anatoli Granovsky (Soviet agent in the NKVD, predecessor to the KGB) in "I Was An NKVD Agent" talks about attending sex school. Half of the men would be trained as homosexuals. I believe their job was to spread homosexuality throughout the education system, throughout seminaries, etc.