It's a learned bigoted reaction that can be unlearned.
It's a natural reaction.
Not enough is known about it to explain it.
Other (please elaborate)
Can't we just turn Congress off and then turn it back on again?
I think men kissing is pretty gross, not gonna lie. That doesn't mean that homosexuality is wrong. I think BDSM and watersports are gross too.
For: legalizing drugs, gay marriage, abortion, guns, universal health care, public sector jobs, nuclear power, free education, progressive taxation
Against: corporations, make-work, the 40 hour work week, intellectual property, imperialism, "homeland security," censorship