I have a very good FWB that I love getting together with and genuinely value as a person. An all around great guy. A few months ago he invited me to a group sex evening with a couple he'd been with before. (There was also another couple there that neither of us knew.) The guys were really nice, the sex was good, and the vibe was fun. I'd be happy to do it again. One of the guys my FWB knows has messaged me several times and wants to get together again, either with or without my FWB.

I'm not sure what the rules (or whatever) are in this type of situation. Is getting together with him without my FWB ok to do? I don't want to do anything that would jeopardize anyone's friendship.