And what is the audience of the adult websites? It is the same audience that reads NYTimes and WSJ and WaPo. Everyone on the internet watches porn - except some that prefer to read it.
Those same ads would work here just fine.
In other words: no, this is a different audience than the audience that's reading those sites; these are horny readers of those sites.
A big difference.
(Yes, I made that WAG up with no evidence whatsoever, so I'll be more than happy to see statistics or hear from anyone who disagrees.)
Assuming that women watch mainstream porn video somewhere close to as often as men because both men and women like sex seems like the same sort of category error as assuming that roughly as many men as women read sexy romance novels under that same rationale.
kids watch/read porn.. grownups do the real stuff :)