I know about the prostitutes (White women), but the sleeping with men part I’m dubious about. That may be confused with Malcolm X, who was a male hustler when he was younger. As for being “slow on his feet”, I’d take issue with that. I saw an interview of him on Merv Griffin from the mid ‘60s and he was pretty well able to handle solid questions and a fairly intellectual discussion. My father saw him in person at Berkeley where he was able to shift topics from Civil Rights (which the crowd was bored to hear about) to Vietnam (which he wasn’t apparently prepared to address except peripherally, but did so when the crowd demanded it).
Malcolm X was a prostidude? Dude!!!
I found this on MLK gay
https://www.straightdope.com/columns/read/2449/was-martin-luther-king-jr-a-plagiarist/
Allegedly there’s audio of an orgy and he requests a gentleman present himself for oral. The link says some people think it was merely “ribald repartee”.