While other unfaithful presidents were satisfied with little affairs here and there, Johnson's bevy of babes was referred to by his male aides as a harem (he was said to be jealous of Kennedy's womanizing ways and wanted to top him). Johnson would make passes at secretaries, and it was known that any who accepted would be promoted to private secretary, two words that in this context should probably have air quotes around them anytime they are uttered. By the time he was done, virtually all of his secretaries, plus his two mistresses, got the Johnson Treatment.
He then tasked the Secret Service with keeping his philandering from his wife, but it obviously did not do a good job at that. His wife had full knowledge of everything and sometimes even supported it. At parties, he would make obvious passes at girls right in front of his wife. One of the girls who stayed over at his place got awakened in the middle of the night by Johnson holding a flashlight and saying, "Move over. This is your president."
Which goes down in history as the second-greatest pickup line ever, losing just barely to, "Hello, I'm an astronaut."
As for waving around his cock (a little extension of him that he had affectionately nicknamed "Jumbo"), he was said to piss in public whenever he felt like it, and if anyone dared confront him, he would whip his dick around and challenge the poor sap with, "Have you seen anything bigger than this?"
No wonder his wife was cool with it.
She wasn't down with the mullet, though.