Porn sites here in Philippines are already banned a few months ago because of it's bad influence especially to the millenials. But getting porn sites to accept bitcoin is another story. It is not acceptable. It is not a wrong practice or use of bitcoin. We just use our common sense. Why we use bitcoin to purchase something that is not good for everyone.
That is an interesting way to look at things, because after all one of Bitcoin's biggest use cases has been to buy things, which you don't want others to associate you with - freedom.