Gain their trust in PMs and they will reveal all the sick shit they are into.
One guy (now banned) showed me that he's into something called femdom joi, which are videos of foids insulting the viewer and humiliating him while he jerk off, the viewer also stroke or stop stroking his dick according to what the foid tell him to do in the video, most of the videos end by her ordering him to eat his cum which he did once.
Another user who is still not banned jerk off to videos with the same nature but the foid role play as his sister, so the guy basically wants to get sexually dominated and humiliated by his sister.