Hi Newyorkdude,
Great to come across on this forum who is more familiar with Tokyo than myself!! ;-)
Regarding the adult website monetization, though they say "Sex sells", perhaps we should forget this old adage in the internet world.
If we stick to adult domain name flipping, is there is a good market for good keywords? Are there examples of the same in the .in, .co.in category? (Ofcourse, sex.in, porn.in, nude.in, etc must have already changed hands at top dollar.)