I'll be honest I would of thought that a porn site would have started accepting Bitcoin because of the anonymous factor. I think the first porn site to adopt this will make a lot of money.
Well, the first one was back in 2014. At least the first major porn website.
Nowdays, we can see so many, small and big, who are accepting not only BTC but also other currencies.
Also, several ICOs have already launched and raised funds based on their "porn product".