Makes sense really, it is the obvious choice.  If anybody has had an eye on the altcoin scene over the last year or so there have been coins created specifically aimed at the porn industry, some of these more obvious than others.  We had Tittiecoin, Sexcoin and so on, I don't think there was ever an Adultcoin which would make more sense and would probably have more adoption as it is not as in your face as some of the blatent porn named coins.