Unnatural sex: Volokh parses the meaning of the "unnatural" argument against homosexuality in two posts, here and here. Importantly, he points out that there is really no difference (at least biolgically, or naturally) between a couple that is "accidentally" incapable of conception, such as one where the female is infertile, and a couple that is "fundamentally" incapable, a gay couple. It's all worth reading. I would just like to add to the list a couple that is "intentionally" incapable, meaning those who use contraception or the "I promise" method (you know what I mean). This would pretty much cover all the sex I, and many others, engage in. And I feel perfectly natural.

I swear this is the only time I'll go there, so to speak.