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.
Don't act like you are in a good side. Exposing bitcoin to different porn sites and accept it as a mode of payment is such a help for bitcoin to expose into huge coverage of market. A lot of people are watching porn so if bitcoin will become a mode of payment then it will make them wonder of what it is and once they fully discovered bitcoin then it will become more popular.
If its true that porn sites are really banned in the Philippines (which I dont think is true, you may mean just one site being banned), there are still other countries that does not ban these sites so they could still benefit the use of coins as payment.