Fetlife isn't bad. I've never used it as hook up, per say, but I've gotten involved in the kink communities in Seattle and Chicago through it, and met multiple long term female play partners through it. Seattle, and all along the pacific NW is especially active. If you want sex, go to Tinder or related. If you want to spank some bitch, have some girl act as your dog, get tied up and beat, or make some girl wear diapers for your pleasure, it's a good place, though. Best way to meet people is through "munches" or "play parties," as well as dungeon events, though, and not just posting wanted adds, as way too many men already post wanted adds. Join some "[kink interest] group," wait for events to be posted, then attend, and not be terribly hideous or creepy, and you'll immediatly meet people.