There is much scientific research into the whole sexual orientation area and it mostly points to a biological cause not a "choice".
Biological cause eh? That makes perfect evolutionary sense. Please. If that were even remotely true then all homosexuals would be gone in 1 generation (because they wouldn't procreate
'Now isn't it amazing. I tell you that nobody made a simple toy like that (solar system model) and you don't believe me. Yet you gaze out into the solar System - the intricate marvelous machine that is around you - and you dare say to me that no one made that. I don't believe it'. -Sir Isaac Newton