The male-superior position gets its name because the penetrating participant is on top or “superior” position. ("Superior", as a medical term, means above or over top of.)
The receiver lies on their back for penetration with legs typically flat against the bed. They may also be bent at the knee with feet flat on the bed. The receiver may also rest their heels against their partner’s shoulders to deepen the penetration, in a variation known as “raising the mast.”
While engaging in this position, the penetrating partner may use their arms to hold themselves up or rest their whole weight on top of their partner. The penetrating partner may also straddle the receiver’s legs, in a variation sometimes called the “starfish,” to increase friction.
The penetrating partner controls the depth, force, and pace of the sexual encounter in the male-superior position, although the receiver can intensify the sensations by pushing back against the mattress or moving their pelvis from side to side.