Sorry if I overreacted, but, being a biologist, I have to say that you are plain wrong. Lots of animals are gay or bisexual, humans are by no means an exception. Almost all female bonobo chimps, for example, have lesbian relationships. Tell them it's unnatural, but they might not listen. There's simply a variation in nature, for animals and humans, so not to accept it is foolish, and labelling it unnatural is beside the point. Maybe a reason for me to overreact is that the son of our neighbours jumped off a building in Berlin cos he thought he was unnatural. In fact, his ultra-religious parents were, who pushed him into his suicide, but they realised a bit late. Tant pis.
Anyway, that will hopefully be my last comments on this topic. I do not want this thread to turn into another slagging match, where people get angry and ignorance comes to the fore. I'm sick of getting lots of neg rep, just because you don't like what I post, regardless of whether it is true or not.