Ha! I knew someone would mention her.
It is rumored that Jackie knew of JFK's affairs & was okay with it. Actually, she would invite young, pretty girls to parties because she knew it would arouse him.
Marilyn was the only one that she had a problem with. Marilyn called her once & Jackie said, "Marilyn, you'll marry Jack, that's great ... and you'll move into the White House and you'll assume the responsibilities of first lady, and I'll move out and you'll have all the problems."
I also read that alledgedly Jackie was a horny thing & had her own list of lovers. It was like a game between them.