Warbler said
As to what makes it bad, I really am not sure. My religion says its a sin. Maybe it is that it might be unnatural or that maybe sex should be about procreation and that can't happen naturally between gays.
That's it. And you know why? For the same reason Jews or Muslims can't eat pork or drink alcohol: they lived in rough conditions. And for a population to live in the desert or any other harsh habitat, you have to really concentrate your energy towards being productive. So masturbation and any waste of seed (that includes homosexuality because it isn't used for procreation) is put under the stigma of taboo, and it becomes bad.
Just so you know, saying this stuff leaves a very bad taste in my mouth.
That's because you're thinking with your own head, and you know it's bullshit.