That's true. About a year or so ago I read her biography. She was, in fact, pretty promiscuous.
Interestingly---and sadly---she spent her youth trying to earn her father's praise, with little success. She wasn't in love with Rainier, but thought becoming a princess might finally accomplish that goal.
Yeah, that’s the truth - she slept with everybody. I wish she could have married a prince of a higher station than Monaco but I guess he was the only one around. (Unless you count Zsa Zsa Gabor’s husband!)
Still she was a beautiful woman, a good actress, and the epitome of class and style on screen. Pretty good legacy.