For example, a woman should avoid lying flat on her back after the fourth month of pregnancy, because the weight of the growing uterus puts pressure on major blood vessels. Variations in the positions may vary the angle and depth of penile penetration. Christakos assures, "This position can give the woman plenty of clitoral stimulation if the man leans forward thus rubbing his pelvic bone against her clitoris. Some men try to control their orgasm until their female partner also orgasms, but this is not always achieved. Unsourced material may be challenged and removed. A woman can adjust the position of her legs for comfort, variety and to control the angle and depth of penetration. After a man has achieved orgasm, he will normally collapse onto the woman and will normally not be capable of further thrusting. While many states formerly outlawed oral sex , anal sex , buggery , or other "unnatural" acts, no US law has banned dorso-ventral heterosexual sex, or specified which partner needed to be on top. January Learn how and when to remove this template message In the missionary position, a woman lies on her back on a bed or other surface with her legs comfortably spread with the soles of the feet resting. A pillow or sex pillow especially a firm one can be used,  to alter the depth and angle of penetration. Some are flexible enough to cross the legs behind their heads.
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