It's true that there is little absolute need for an alt coin in this situation (as in most situations). However, the adult entertainment industry is known to appreciate novelty. SexCoin provides this, if nothing else. It integrates well into the fantasy; fantasy is wrapped into every aspect of adult entertainment.
Why can't Bitcoin be a novelty? Bitcoin can be sexcoin and drugscoin and whatever else you want it to be.
Btc is no go. It takes 50 mins to confirm a trade. But you can't keep it hard for 50 mins before someone accept your entrance rrquest