The woman performs a leg-clamping position similar to the straight-pen stroke. The man lies flat on the bed with his legs stretched out and tightly clamped; the woman applies pressure from above, with her legs spread apart next to the man's legs, moving back and forth for intercourse. □ An advantage of this method is that both parties experience a strong sensation of skin pressing tightly together. The man can also caress the woman's breasts, providing multiple sexual stimulations for her. □ A disadvantage of this method is that it consumes a lot of the woman's physical strength. For those who are obese, this style may be more difficult. □ Viagra Index: Difficulty **, Romanticism ***, Sensation *. In the "One Open Three Styles," the man lies flat while the woman is on top. The man can place his legs on his partner’s back, waist, or clamp them on either side of her hips. The man can also use his hands to increase the frequency of the woman’s movements, enhancing the sensations.