Hentai perhaps. @otc
has already posted in other threads about all the Overwatch porn available. I'll leave him to be the expert.
Well if you are going to let me be the expert, then I will say that in my expert opinion, there is definitely a market for people who will get off to rendered versions of the hottest video game characters they have ever seen. But there are also people who will spend $$$ on silicone dolls to stick it in, so that's not saying much.
Also, I somewhat dispute the processing power argument. You wouldn't have to render it all live. With enough storage space, you could prerender things. Could have plenty of choose your own adventure style branching...prerender the scenes and transitions. Because you are controlling the models, you can make sure all of the transitions are totally seamless...If you were using live actresses, You'd have a lot of trouble capturing them doing all of the small variations that might be in the game and making transitions look seamless.