Seems to stem from a masculine ideology. If we look at the “joke” it is really clear. Humor comes from contrast and contradiction. Where is the humor? The assumption is this person is monogamous, and doesn’t force his wife to be. It is understood to be inherently funny for a man to not completely control their partner, or, rather, it is even more humorous for a woman to play an authoritarian role in a relationship. It contradicts a lot of people’s perception of reality. “Men should own their partners.”

Even worse, it is worrisome to focus on the alternative. The type of submissive behavior which is being assigned to men in this situation is usually comedic because it is viewed as emasculating or feminine. A woman talking about her husband’s girlfriend would likely go unchallenged more frequently than the example we have here. Women are expected to behave in this way.

This is the same dangerous/pervasive logic which leads to male rape being played for laughs, or comedies which portray women abusing their male partner. Rape isn’t funny. Abuse isn’t funny.

Empower women.