Before I did a deep dive into the word cuckold and what it has always meant and everything it means nowI just had this vague idea that a cuckold was a man worthy of mockery.
A cuckold is the husband of an adulterous wife. In evolutionary biology, the term is also applied to males who are unwittingly investing parental effort in offspring that are not genetically their own.
Cuckold, when used in a fetish context, describes the fetish of men who find masochistic pleasure in watching their wives have sex with other men. The man is complicit in the infidelity and often helps arrange the meetings.