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.
Using the "Vibrate" interaction on the Vibromatic Heart Bed costs §20, though many custom beds based on it were modified so that they did not charge.
The Sims 2
The Sims 3
The Vibromatic Heart Bed is reintroduced in The Sims 3 with the first stuff pack, The Sims 3: High-End Loft Stuff. It gives 3 energy, so it is not the best bed to sleep in regularly, however it considerably raises the odds of conceiving a baby.
The bed regains its name from The Sims, however, resembles the More Romantic than You Double Bed.
There was one cheat commonly used when Sims were performing this action in bed. If the player engaged the "Move_objects on" cheat and moved the bed to a separate part of the lot, the player could then see the Sims nude and hugging while suspended in mid-air. When the Sims had completed their routine, if their energy was high enough they would climb out of the bed wherever it was placed on the lot.