The japan position is derived from the Japanese Kamasutra. The man sits on a big sofa chair, with his legs wide open. The woman sits on top of the man. She swings one leg over the sofa chair’s arm, while her other leg is placed in between the thighs of her man.
The woman’s arm embraces the shoulders of her lover at the back, while her other arm sits on his thigh. The man has the leverage of sucking the woman’s nipple and fondle with her breasts, while one of his arms supports her weight at the back. He enters her from behind in this position, and he can use his free hand to stimulate her clitoris.
This sex position is not easy to perform, though it looks relaxing. But the woman can help ease the thrusting by using her legs to push upwards to give room for the man.