Porn is worldwide billion dollar industry.. With bitcoin being associated with it means more mass acceptance and more positive impact on demand and price stability. Still i believe there should be regulations which regards to accessing porn sites and porn materials.
Well there are some forum's that have adult zone in the category wish bitcointalk have something like this but maybe it will just move to off topic category because it is not about bitcoin, but if a site is accepting bitcoin why not.
This is a very very sensible application of bitcoin. My only question is, who the heck pays for porn these days?