My roommate is a gay man who is into getting fisted. A lot. We were FWBs until he moved into my place, at which point we agreed it would be better for us to not have sex anymore. It’s worked out fine, and he’s been here for a year. Here’s the problem: About two years ago, he got into fisting and he has someone over every night to fist him. As soon as he comes home from work, he spends a good hour in the bathroom cleaning out, and then some guy comes over to fist him. Every single day. My roommate is a very attractive guy who doesn’t think he’s attractive at all. I’ve talked to him a few times about whether he’s being sexually compulsive, but he just laughs and says, “Well, you suck a lot of dick.” (I have a healthy but moderate sex life.) I am concerned that...