No no, see, it's not that same-sex marriage will lead to gay orgies. It's that same-sex marriage will lead to women being raped constantly by roving gangs of bad men and forced into concubinage. Because marriage is a shield against sexual abuse and married women are never, ever raped. Anyone who claims a woman is far more likely to be sexually abused by a husband than a stranger is talking utter nonsense. Husbands can't sexually abuse their wives, because husbands are allowed to do whatever they like to their wives (well, maybe not kill them) and the idea that the wives might have an opinion about the matter is laughable.

Therefore, romance novels in which the "hero" rapes the heroine: peachy keen, so long as they get married so he can control -- er, protect her! Romance novels in which two heroines have loving, consensual sex with each other: anti-woman and encouraging rape.