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.
Right now, there are dozens of porn websites which accept Bitcoins. But as of now there is not a single one, which accepts any of these shitcoins. Many of the coins which you had mentioned, are not even actively traded right now. We don't need a separate coin for porn, another one for online shopping, and yet another one for gambling. Bitcoin can be used everywhere.
Which porn sites accept bitcoin (just out of interest?). Are there any camsites that have adopted it yet? I think they could benefiot greatly from bitcoin.