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These positions are used for vaginal or anal sex.The basic position is called the missionary position. In it, the receiving partner lies on his or her back with legs apart. The partner lies on top of the receiving partner, facing them. The penetrating partner enters so that the base of the penis rubs the clitoris.. From behind. Most of these positions can be used for either vaginal or anal sex. Oral sex is when one partner uses the tongue, mouth or throat to excite the other partner's sex organs. For males it can include placing the penis in one's mouth and for females licking the vaginal area. Sometimes oral sex is performed as a way of getting ready for intercourse, but it may be done as an alternative to intercourse.
Sexual intercourse (or coitus or copulation) is principally the insertion and thrusting of the penis, usually when erect, into the vagina for sexual pleasure, reproduction, or both. This is also known as vaginal intercourse or vaginal sex. Other forms of penetrative sexual intercourse include anal sex (penetration of the anus by the penis), oral sex (penetration of the mouth by the penis or.