I don't really feel Bitcoin is going to need porn in its entirety. As of now, we already have a bad reputation. We'll need to rethink this, I believe.
Maybe it will be also the one who can advertise it more. It will be helpful. There are a lot people that are open with those kind of thing now. They dont really care much anymore. It is really the new age.
I dont think the porn viewers would ever like others to know about this. No matter how advanced this world gets but still they would prefer privacy. I think Bitcoins can be nicely used for this purpose as no one knows which address belongs to whom.