I think bitcoin and porn would be an excellent mix overall considering how people would prefer to maintain there privacy when it's related to things like that, Here you don't have a payment to a porn website in your CC statement but this one is just a number to a privately generated address.
Indeed basically bitcoin is a digital currency that gives privacy a very secret to everyone. so indeed bitcoin is used by a variety of things that do require privacy very closed. Same thing with porn or dark market, all of that is the Foundation for the growth of the bitcoin or things that make bitcoin can grow the better (in my opinion)
Yes, bitcoin would be very helpful regarding with this transaction especially to those people who dont want to compromise their identity when they are intending to buy or pay from a certain pornsite which is are really good thing for those people and yet porn industry is huge which could be a good publicity and promotion on bitcoin.