Cheap shot.
That is the rumor I have heard some women, who say they in turn have heard rumors from women who are nurses who have heard that about him, from women he slept with. The word is that his penis is small and deformed, which would explain a lot about his sexual insecurities, and maybe also his obsession with crowd sizes at his rallies and those of his opponents. No doubt some very Freudian stuff about the sizes of different things that matter to him, lol...