Activity: Cuckolding
These works feature cuckolding. A main character derives pleasure from seeing their partner be sexually involved with another person.
This does not include poly relationships where everyone is in a committed relationship. There may be a single person used for the cuckolding, but if they are not in a committed relationship with the main pair, they are not considered poly. However, if the poly relationship begins with a cuckolding scenario, it may be included here.
This does not include cheating, as cuckolding is a consensual kink where both parties agree that one of them will have sex with someone else.
Open relationships and threesomes are included if part of the pleasure is derived from the main partner watching their committed partner consensually have sex with someone else.