I would let a lot expire. Many you will never sell or develope. Were talking $15,000 to renue them all. Get rid of half and save 7.5K/year.
At random this is one that will prob never sell or be developed: adultsingals.com
But we all have to decide. I wasted a lot of money (for me) renuing domains for so long.
Eventually someone has to make the decision and go through them all. I dont envy you.
Best move i ever made was selling all domains that I am not using. No more speculation. I lost my butt on renual fees over the years and should have let many expire earlier.
Very tough to sell domains in adult and I dont see it getting any easier.
asdporn.com is as good as anything (unless it is a really targeted domain or gets good typeins). Just a name I made up.
footfetish17.com
lesbianporn69.com
more examples i just made up that prob do as well as paying more than reg fee for a keyword domain.
This is how today's affil thinks.