Homosexuality is not akin to bestiality because the animal has no choice in the affair. Similarly, there is no slippery slope from legalizing gay marriage to legalizing sex with minors because minors are also perceived has not being able to make a concious choice in the matter. The only slipperly slope gay marriage might lead to is polygamy.
you are absolutely correct. And polygamy was sanctioned by the Bible. End of story. Thanks for the rationality.