Why should the majority opinion get to say who's an adult and who's not? Aren't we taking away the rights of minors to marry by claiming that they're relationship would somehow be different to a traditional one?

You anti-minor-marriage bigot you.

(To be clear, this is sarcasm hopefully in the service of making a point. I am not arguing for marriage between adults and minors.)

C'mon now, illustrations of a slippery slope oughtn't start so far down the hill.

So, what about a post-menopausal mother marrying her adult son? If "consenting adults" is the standard, it must be sanctioned as "marriage," yes?

For the record, I'm not really against gay marriage, but I am staunchly against inconsistent reasoning in service of realpolitik.