Then explain again how a trait that is not hereditary, found in people who most often do not reproduce (and among those who do, the trait is not necessarily passed on) is steadily present in the general population. If you try to tell me that people choose it, thus choosing a life of being discriminated against, beaten and in some cultures legally murdered, you will have to explain to me why someone would make that choice--particularly since so many straight men have declared to me that other men are gross and therefore gays couldn't possibly be attracted to them.