A cuckold is a man who enjoys the humiliation of his wife having sex with other men. Typically the cuck is under endowed (I'm a slender 5") and the relationship evolves into the wife taking other lovers who can satisfy her better. My wife has had 7 different men in the last few years, all of which were considerably better endowed than me, and all of them satisfied her pussy better than I could have dreamed of. I usually just perform oral on her and she gets her intercourse satisfaction from other men.