I just remembered who Marilyn’s friend was. Her name was Jeanne Carmen.
She said that listening to Sinatra sing made her want to jump on him and make love to him. After she did, it turned out he was a poor lover.
Check out “His Way - The Unauthorized Biography of Frank Sinatra” by Kitty Kelley, 1986.
Sinatra sued her twice & lost. Then he announced, don’t be seen reading her book in public. Vito & the boys would not approve.