This was breifly covered in the gay marriage topic, but to keep that thread on topic I thought I'd post here.

How can some people not accpet that homosexuality is an abnormality I don't mean abnormal as in uncommon. I mean abnormal as in a malfunction. I'm sure most would consider beastiality or mechanophilia as abnormalities but why not homosexuality? I'm not questioning the morality of homosexuality here, just from a biological viewpoint i'm saying.