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it was a funny comment, but those threads are really an embarrassment -- questions like "my girlfriend wants me to poop on her, how do I do that" or "tell me how to come in my wife's face without ruining her hair" reinforce the view of MeFi as a community of clueless nerds, when in fact it's not necessarily the case, as anybody who's ever gone to a meetup knows some of us are actually normal people.
I also think most of anonymous sex questions are fake, ie badly disguised jokes, but then, more power to the moderators, I'm sure it helps the site's membership (ie, financial viability)