You shouldn’t trust them, but it’s hardly an extraordinary claim. We can extrapolate from King’s heroic figure, charm, and constant traveling that he would been positively drowning in opportunity, to say nothing of the temptation that comes of being away from home for extended periods.

If you care enough to explore the matter—although why you would consider it consequential I don’t know—you might start with Ralph David Abernathy, Sr., a close friend of King’s and a fellow civil rights leader, who confirms King’s alleged “weakness for women”.

Good point, but my understanding is that it was kind of an open secret in the civil rights community at the time. And I they include a tape containing proof, as I recall.