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Age play is a form of role play in which one or both partners pretend to be (and get off on being) an age other than their own. Chances are you've already experienced what could be considered ultra-lite age play if you've ever called a partner "baby" in bed. Another common example is the "daddy dominant–baby girl" setup. If you're calling someone "daddy" in bed you're engaging in light age play. A more "extreme" and less common example of age play is full-on role-playing where one partner is turned on by wearing a diaper and acting like a baby. Calling someone "baby" or dressing up like one is totally okay if everyone involved is into it. "It involves consent of all involved," explains sex therapist David Ortmann, author of Sexual Outsiders: Understanding BDSM Sexualities and Communities. If age play turns you on, start out slow by using words like baby or daddy next time you and your partner are getting frisky.