I am not real surprised by this, because he seems so willing to try almost anything.  When Newsweek gathered some of the likely Oscar nominees to discuss their craft, and and the discussion turned to on-screen love scenes, James Franco referenced a sex tape he made as a teenager:
“I think if anybody who has made a home sex tape knows, what feels best doesn’t always look best,” he said. “I remember when I was 19 doing that, and then watching it back and thinking, oh, that looks horrible… You have a lot of respect for those actors in pornography, because they are really not just doing it, they’re really selling it. It’s the same thing with a kiss. It’s not just the kiss that feels best, it’s an image. Something different is happening if it’s a good kiss.”

And whoever might still have that tape, probably is going, oh it was that James Franco in my film.  Time to make some money!