It probably would have been cheaper and easier for you to register a new domain for $10 and do as much research as possible related to online adult marketing etc. Visit as many resource sites such as GFY, etc. etc. and once you have a firm grasp of the way the business works and the legalities pertaining to online adult material you should decide what direction to go from there.
This would save you a lot of headache trying to sift through someone else's mess trying to clean it up, and would eliminate the risk of being sued for copyright infringement or worse.
I understand your enthusiasm, but diving head first into something such as online porn may not be the best approach considering that many of the laws regarding online adult material are vague at best, and may differ greatly depending on your geographical location.
This is just my
Good luck in your endeavors