I remember the concept of cuckolding was a frequent topic in Penthouse Forum back in the late 70s and early 80s. A friend and I found a cache of those & other magazines including Screw, Hustler, etc. I remember there was a story in Penthouse called "The Most Perfect Mrs. R" or something similar, about a horny wife who seduces a young guy and cucks her husband. The young guy is really nervous but it turns out the husband enjoys it as much as he does. There was an even better story in one of the raunchier mags, about a white couple who make friends with a big rough black guy. It told of how the white husband at first befriended the guy, and how things slowly progressed to the blonde wife liking him as well, as he was really not dangerous but rather a lovable giant. They ended up in the couple's hot tub together and discovered he was also hung like a horse. They gradually moved to a 3-way relationship where most of the sex was the white guy warming up his wife and cumming quickly, followed by the black guy stretching and then pleasuring the blonde wife with his huge cock for extended periods while the husband watched. Despite it being the 70s it was a story ahead of it's time in that it focused on the wife's feelings and desires more than the guys. How she went from being fearful, to in pain, to being able to handle the big tool, to enjoying it, once she figured out her husband needed to fuck her first to open her up for the BBC. I jerked off like crazy reading that story and while I don't have a copy of it anymore I remember it like yesterday.