The Superman position is a rear-entry sex position where the penetrating partner holds up the receiving partner so they are horizontal in the air. In this position, the receiving partner looks like they are flying through the air, like Superman.
To get into the Superman position, the penetrating partner stands behind their partner with their feet flat on the floor. The penetrating partner then supports the hips of the receiving partner and lifts their pelvis up so their feet are off the ground. The receiving partner can place their hands on the legs of the penetrating partner for support. Penetration occurs from this position.
The Superman position is sometimes called the Superhero position. It should not be confused with a sex act called the Superman, which involves ejaculating on a person’s back, then sticking the bed sheets to their back so they resemble a superhero cape.