The woman sits riding on the man and guides the penis in the vagina. Once the penis is inserted, she contracts her vaginal muscles to maintain     the penetration, to avoid unexpected releases, and to    control and direct the depth of penetration. By tightening her legs, the   pressure on the penis becomes more intense, and the stimulation of the vaginal lips is much more burning. However, the amplitude of movement stays limited and the penetration is of limited depth. The man can easily caress the breasts and clitoris of his partner to bring her to orgasm in this sitting position. This position is highly recommended to men who          experience premature ejaculation.