You are reading a single comment by @Oliver Schick and its replies.
Click here to read the full conversation.
-
That's just a general euphemism for intercourse. It can probably be applied widely but equally apply to just one couple.
https://en.bab.la/dictionary/french-english/faire-une-partie-de-jambes-en-l-air
Oliver Schick
I like that the French term for gangbang is "a party of legs-in-the-air".