https://en.wikipedia.org/wiki/Candaulism
Candaulism, or candaulesism, is a paraphilic sexual practice or fantasy in which one person exposes their partner, or images of their partner, to other people for their voyeuristic pleasure. Candaulism is also associated with voyeurism and exhibitionism.. The term may also be applied to the practice of undressing or otherwise exposing a female partner to others.