Yeah, I think these sites pop up from time to time but seemingly always get pulled and drift towards hookup sites and "dating" sites. I think AFF was one and then became what it is now. Maybe the word "adult" was psychosocially loaded with other meaning in this context and took over the original mission.
The problem with these types of sites is the cold start issue. Not enough users to make people stay engaged. After viewing few to no options, most users will move on.
Bumble tried to tackle the issue with its BFF feature, but it is still underused. Very few people on the app.
