I would say no. Personally I prefer ranking for keywords. If I were to rank for a keyword like 'super sexy babes'. I would look for a domain name called supersexybabes.com/net/org.
Let's face it, the chance that you'll rank high in the keyword 'porn' is REAL small.
You have 2 options now, target keywords like I explained or get a catchy name like pornhub or xvideos, get a neat looking site and advertise a lot.
Personally I'd start out with the keyword ranking and once you build a little 'empire' you can do the advertising one.
Hope this helps
