We launched "Netflix like" Pornhub Premium last year. We license thousands of scenes from all the top producers. It's $9.99 a month with a free trial (real free trial, not the normal porn stuff where they charge you anyway). It's closer to say Hulu Plus though because you also get the regular Pornhub content without the ads and better quality.
Personally I have two issues with subscribing to that: I don't want what I view traceable to me (hence I always use porn mode in my browser) and I wouldn't be comfortable handing my CC to a porn site, because I assume it would be very difficult to cancel.
"It's closer to say Hulu Plus though because you also get the regular Pornhub content without the ads and better quality."
That by itself could be a great market. Porn sites are notorious for inefficient, disgusting, and sometimes malicious advertisements. Getting the product without all that for low cost would appeal to many. I'm curious what the actual numbers are on one of the highest, trafficked sites. It could provide a nice, upper bound on what others might expect with their actual results being lower unless they're a niche operator like Kink.
