Do you fantasize about having an open relationship? The Doctors reveal just how many people long to be with someone else besides their partner.

According to research, 30 percent of people reveal that being in an open relationship is their biggest sexual fantasy, and a whopping 81 percent of people admitted to fantasizing about it at least once.

Watch: Most Popular American Sexual Fantasy Revealed!

Plastic surgeon Dr. Andrew Ordon says, "Who hasn't thought about it once!?"

And while a large majority of people might be thinking about having sex with someone else, clinical psychologist Dr. Judy Ho notes just 20 to 30 percent of people ever go through with it.

Dr. Judy explains having an active fantasy life is a healthy expression of someone's sexuality, but stresses that stepping out of a relationship is not how issues within their primary relationship should be addressed.

Watch: Can Sex on the First Date Lead to a Relationship?

And to avoid a sexual recipe for disaster, The Doctors stress that all parties "need to be on the same page" when it comes to the rules and expectations regarding a possible open relationship.

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