To play, send a Sim to turn the bed to "Vibrate" and have that Sim lie in the bed. Then, send a loved one to play in the bed. Then they "play", with their Fun and Social meters rising. If the Sims are of opposite genders, the "Should we have a baby?" question may appear. However, it is possible that a baby will appear spontaneously after Sims "play" in this bed, or in custom beds cloned from it. While that isn't supposed to happen, it has been known to happen. Same-sex couples can "play in bed", though that will not produce a baby.