We love the Snail s-e-x position! Lying at, the woman pulls her knees into her chest and throws her feet over the shoulders of her partner. He kneels in front of her and enters her, taking his weight on his hands, on either side of her shoulders. As this is a position for deep penetration, it should only be tried when sufficiently lubricated to avoid any pain for the woman.
It should be very stimulating for her, especially if the man ejaculates in this position.