The term "cuckold" is believed to allude to the habit of a female cuckold that lays her eggs in the nests of other birds. References to cuckolding dates as far back as 1372 in Geoffrey Chaucer's The Canterbury Tales.
More on Cuckolding:
Is Cuckolding A Fetish Or Subconscious Fear?
Before You And Your Partner Consider An Open Relationship, Cuckolding Or Polyamory