Homosexuality

[Zkuq]

Locknuts said:

I don't think this is something that I've been taught to find disgusting, I think it's built into me (born this way).

It could be because it's not what you've been taught to be normal either. It violates what you believe to be normal so strongly that you have a strong reaction to it. Or not. This is all my speculation and I don't know if it's the actual reason.