Frank Sinatra was a little bit ashamed.
According to his biographer: "I think we can take it as fact that Frank Sinatra was very well-endowed. George Jacobs, Sinatra's valet in latter years wrote a wonderful book, called Mr. S, and he speaks in the book about the size of Sinatra's manhood and actually having special underwear made to kind of keep it all in.
He sort of hated the way that he looked for a lot of his life… and I think that, while he often boasted almost about his manhood, it was one more thing that made him different.
Ava Gardner famously reported to her ex-husband Artie Shaw, at a time when she was growing dissatisfied with Sinatra, that being in bed with him was like being in bed with a woman. That was reported by Artie Shaw, who was very competitive with Sinatra… but if indeed Ava ever said anything like that, I think she may have been reflecting more on Sinatra's sensitivity, his vulnerability.
There were a lot of women, so he must have been doing something right… I think women were thrilled just to be with him and I think that goes a long way in the sexual experience."
( via perezhilton.com)