Awww, everybody has things that turn them on and then things that don't turn them on. You can't help what those things are; though it's possible for tastes to change you can't force it on yourself. You're just plain heterosexual and that's that. I'm the same way; doing anything sexual with a female doesn't do anything for me, in fact it turns me off. So I just don't do those activities. It's just a hard limit for you, that's all; and you shouldn't try to force yourself to be something you're not.

Haha, being exclusively heterosexual in this community is uncommon, but with the level of acceptance there is, I think we can handle a straight guy. That certainly doesn't make you sexist *laughs*. Sexism is when you disrespect a person based on their gender, or think of them as lower or less important than the other gender. You most certainly are not doing that. So relax! Just be who you are, as long as you're respectful towards everyone there's no harm in it.