At the time, Chastity mansion had a lot of focus on cuck and sissy play, and most of the users seemed to interact in character; that is, as "Mistress Cruella and slut sally" instead of "Karen and John" (or whoever). Chastity Mansion wasn't the only place that did this, by any means.
The past year or so has seen a transition over there (for the better, IMO, and I wish them well.
This thread may have a better explanation, more specifically this:
This board was created by a group of people who wanted to discuss the day-to-day experiences of chastity, chastity devices, and orgasm denial. We wanted a place to discuss the technical details, the emotional pitfalls, how to get our partners on board (or alternately, to brag a little when our partners did get on board), and the other aspects of living with these kinks. We also wanted to discuss these in an area that we believed we could safely involve our partners, especially if those partners were on the vanilla side. That meant an area that was relatively free of BDSM and some of the more extreme kinks that are often associated with chastity.
New members are welcome to enjoy any fetish you wish. We are not unfriendly to particular fetishes per se; however, we are adults here and we try to act like it (most of the time). We talk as adults, and tend to prefer to be talked to as adults. We exchange information and sometimes experiences, but we don't expect other members to coddle us or cater to our fetishes.