the floor and drapes their legs and thighs over the legs of the penetrating partner. The penetrating partner holds the knees of the receiving partner and controls thrusts. Using furniture or special apparatus Most sex acts are typically performed on a bed or other simple platform. As the range of supports available increases, so does the range of positions that are possible. Ordinary furniture can be used for this purpose. Also, various forms of erotic furniture and other apparatus such as fisting slings and trapezes have been used to facilitate even more exotic sexual positions. Positions to promote or prevent conception Pregnancy is a potential result of any form of sexual activity where sperm comes in contact with the vagina; this is typically during vaginal sex, but pregnancy can result from anal sex, digital sex (fingering), oral sex, or by another body part, if sperm is transferred from one area to the vagina between a fertile female and a fertile male. Men and women are typically fertile during puberty. Though certain sexual positions are believed to produce more favorable results than others, none of these are effective means of contraception. Positions during pregnancy The goal is to prevent excessive pressure on the belly and to restrict penetration as required by the particular partners. Some of the positions below are popular positions for sex during pregnancy. Woman on top: takes the pressure off of the woman's abdomen and allows her to control the depth and frequency of thrusting. Woman on back: like the missionary, but with less pressure on abdomen or uterus. The woman lies on her back and raises her knees up towards her chest. The partner kneels between her legs and enters from the front. A pillow is placed under her bottom for added comfort. Sideways: also keeps pressure off of her abdomen while supporting her uterus at the same time. Spooning: very popular positions to use during the late stages of pregnancy; allowing only shallow penetration and relieves the pressure on the stomach. Sitting: she mounts the sitting partner, relieving her stomach of pressure. From behind: allowing her to support stomach and breasts. Non-exclusively penetrative Oral sex positions Oral sex is genital stimulation by the mouth. It may be penetrative or non-penetrative, and may take place before, during, as, or following intercourse. It may also be performed simultaneously (for example, when one partner performs cunnilingus, while the other partner performs fellatio), or only one partner may perform upon the other; this creates a multitude of variations. Fellatio Fellatio is oral sex performed on a penis. Possible positions include: Sitting The receiver lies on his back while the partner kneels between his legs. The receiver lies on his back while the partner lies off to the side of their legs. The receiver sits in a chair the partner kneels in front of them between their legs. Standing The receiver stands while the partner either kneels in front of them or sits (in a chair or on the edge of a bed, etc.) and bends forward. The receiver stands while the partner, also standing, bends forward at the waist. The receiver stands or crouches at the edge of the bed, facing the bed. The active partner lies on the bed with their head hanging over the edge of the bed backward. The receiver inserts their penis into the partner's mouth, usually to achieve deep throat penetration. Lying While the active partner lies on their back, the receiver assumes the missionary position but adjusted forward. The active partner (with breasts) lies on their back, and the receiver inserts their penis between