>>216166028
There are Shakespeare plays where people insult each other, calling someone a "cuck". The idea of cuckoldry; the condition, the insult, the fetish; is as old as civilization. But it only became trendy recently.
after gay rights became normalized. So, some time after 2015. Normal guys (not just anonymous internet loners) used to call each other faggots as an insult. But it became taboo and "homophobic" to do that. So new insults needed to be invented, to attack someone's masculinity. Cuck is what came out on top, as the replacement of faggot. As the insult gained prevalence, the idea of cuckoldry did as well, and the fetish spread along with the insult; mutually reinforcing each other.