ELI5: Explain Like I'm 5

Cuckold fetishism

Okay kiddo, some adults like to imagine or watch other people have sex with their romantic partner while they are watching. This is called a "cuckold fetish." It can be a way for them to feel like they are not in control or to feel jealous, but it's important to remember that it's just a fantasy and doesn't necessarily mean they want it to happen in real life or that it's okay to pressure someone into it. As with any other fetish, it's important for people to communicate honestly and respectfully with their partner(s) about boundaries and consent.