From the Ananga Ranga: In this warm and inviting variation of the basic side by side position, the man enters the woman and lies beneath her legs. One of her legs remains beneath his and she passes the other over his body just below the chest.
This position offers fairly deep penetration, although not a deep as some others. Nice for a slow romantic evening.
One problem we have found with this position is the restriction of movement.
Good for a slow love making session