A similar question came up on the webmaster forum a few days back, so I thought I'd copy an paste my response here for you:
"Based on our most recent metrics (we are an adult search engine), the three most searched for adult terms are lesbians, mature, and anal. Teens are pretty popular too, but not as much so as the other three.
These are subjective of course, as they can be affected by where we advertise, promotions we run, etc."
If you want to see the entire thread, it's here:
https://gfy.com/showthread.php?t=1091082
Hope that helps.