The biggest thing is jealousy, imho. If there’s any jealousy whatsoever, it’s a killer. It may not kill things while it’s ongoing, but it will cause an issue some time, some where, and be a huge issue.

Like Average Don Juan, I’ve probably been a part of every kind of ‘some’ you can think of at some point in time, and they have their place (if that’s your thing). I’ve enjoyed myself, for the most part. But it can definitely get really awkward!