I’ve had a couple of those situations. In all cases it was a friend that I ended up getting horny with, and then we figured “why not?”. In all cases, the answer turned out to be that shit quickly gets complicated when people develop new feelings because they’re sleeping together.

Frankly, I have no issue with polyamorous people, but I honestly can’t understand how they get it to work. Every time I’ve slept with someone repeatedly over an extended period of time, it ended up fundamentally changing our relationship to the point where being with anyone else became an implicit no-go. I have no explanation for exactly why but those feelings just developed, no matter how much we promised each other they wouldn’t, and pretended they didn’t.