Not really the same thing.
But I once ran a group (I'm forever DM) for a friend. He wasn't an experienced player, but his girlfriend and their boyfriend were. It would have been a total fail if the boyfriend's sister hadn't been in the group too.
The sister was the only one that didn't try to make it all about the threesome in game.
The trio would dive into some kind of circle jerk where their characters were basically flirting with each other constantly. I'd end up telling them to get back to the actual game, or I was going home and they could do their own little thing without me, since there was no point to a DM for what they were doing. The sister agreed, and started making them not sit next to each other on the couch lol.
I wasn't mad, btw. Mildly annoyed at most. But, don't ask me to cook up an adventure, spend time rolling up characters, and drive to your house if all you want is an audience for role-play foreplay lol.