for once, xkcd got a bit of nerd life wrong.
that's incorrect. sure, there are some songs that are inappropriate for sex. but, not the power rangers theme! not the lumberjack song, as referenced in the alt-text! hilarious nostalgic stuff like that coming on during sex only makes it more amusing...and anyone who couldn't appreciate something like that playing during sex is clearly not worthy of hopping into my bed.
sorry, randall munroe...i guess we're just not meant to be.