Hiya,
from my side, as I think dirtbag mentioned... niche and community.
niche has to be good, quality content and not saturated, but cleverly baited within mainstream adult traffic, not saying much more there as it's where I'm starting to get new income.
niche personals/dating, then building community on the back of it is good.
it's hard at first to get members to revisit, otherwise yous site looks sh!te and unused.
mainstream porn/video.. forget it, select content from it that you can bulk up and fit into your niches
Btw, all my adult stuff is whitehat too, I'll keep it that way too I think, although I do have a few automated e-whoring ideas I may try soon..
I'm bringing up BH stuff to supplement it, but not in my adult work
Si