It can certainly be influenced, in that sexuality isn't black and white, but rather a shade of grey with parts that can be particularly embraced. I think it's all rather complex and we aren't quite sure of all the biological and environmental triggers. Either way, the idea that the teaching of homosexuality in schools is gaying up kids is a little extreme; if anything it's just allowing those who would have eventually wound up identifying themselves as gay to do so a little earlier, knowing there's nothing wrong with it.