A man who enjoys watching his wife commit adultery or be unfaithful with other men.

A word used to describe a married man who's wife is sleeping with other men.

Historically a cuckold was a man who was married to an adulteress wife. The dictionary defines a cuckold as “a man with an unfaithful wife.” Cuckolding in this form is as old as the institution of marriage itself. Traditionally a cuckold was an object of scorn among the community and was looked upon as someone who could not satisfy his wife’s sexual appetite. It is only in the last century that the term cuckold has come to take a different meaning.

A man who likes to watch his girlfriend/wife have sexual relations with another man while he watches and touches himself

A derogatory term for a man whose wife is or has been unfaithful.

A married man with an adulterous wife, but current usage sometimes extends the term informally to include cuckqueans (women with adulterous husbands), wittols (husbands who consent to their wife's extramarital sex), and non-married couples in analogous situations.

WORD HISTORY

The allusion to the cuckoo on which the word cuckold is based may not be appreciated by those unfamiliar with the nesting habits of certain varieties of this bird. The female of some Old World cuckoos lays its eggs in the nests of other birds, leaving them to be cared for by the resident nesters. This parasitic tendency has given the female bird a figurative reputation for unfaithfulness as well. Hence in Old French we find the word cucuault, composed of cocu, "cuckoo, cuckold," and the pejorative suffix -ald and used to designate a husband whose wife has wandered afield like the female cuckoo. An earlier assumed form of the Old French word was borrowed into Middle English by way of Anglo-Norman. Middle English cokewold, the ancestor of Modern English cuckold, is first recorded in a work written around 1250.

A cuckold is someone, usually a submissive male, often with a small penis that enjoys providing for a woman who is free to have sex with whomever she pleases.

Usually, but not always she has sex primarily with other men.

Today the term is generally associated with sexual gratification through extreme submission.
Cuckquean: Female Cuckold

When an individual eagerly watches from the corner, his partner being pleasured by another.

A submissive man who lets his wife fuck other men

Will Smith