partners in sexual contact with each include some of the following: One person performs oral sex on one partner while they engage in receptive anal or vaginal intercourse with the other partner. Sometimes called a spit roast. The 369 position is where two people engage in oral sex in the 69 position while a third person positions himself to penetrate one of the others; usually a man engaging in sex doggie-style with the woman on top in the 69 position. A man has vaginal or anal sex with one partner, while himself being anally penetrated by another (possibly with a strap-on dildo). Three partners lie or stand in parallel, with one between the other two. Sometimes called a sandwich. This term may specifically refer to the double penetration of a woman, with one penis in her anus, and the other in her vagina or of a male, with two penises in his anus. Two participants have vaginal/anal sex with each other, and one/both perform oral sex on a third. Three people perform oral/vaginal/anal sex on one another simultaneously, commonly called a daisy chain. The slang term lucky Pierre is sometimes used in reference to the person playing the middle role in a threesome, being anally penetrated while engaging in penetrative anal or vaginal sex. Foursomes A 469 is a four-person sexual position where two individuals engage in 69 oral sex while a third and a fourth person both position themselves on each end to penetrate the two engaged in simultaneous oral sex; similar to a 369, with the addition of a fourth person. With many participants These positions can be expanded to accommodate any number of participants: A group of males masturbating is called a circle jerk. A group of males masturbating and ejaculating on one person's face is known as bukkake. A group of men, women, or both, each performing oral, anal or vaginal sex on the next, is called a daisy chain. When one woman or man is given the serial or parallel attention of many, often involving a queue (pulling a train), it is often termed a gang bang. Multiple penetration A person may be sexually penetrated multiple times simultaneously. Penetration may involve use of fingers, toes, sex toys, or penises. Scenes of multiple penetration are common in pornography. If one person is penetrated by two objects, it is generically called double penetration (DP). Double penetration of the vagina, anus, or mouth can involve: Simultaneous penetration of the anus by two penises or other objects. This is commonly called double anal penetration (DAP) or double stuffing. Simultaneous penetration of the vagina by two penises or other objects. This is commonly called double vaginal penetration (DVP) or double stuffing. Simultaneous penetration of the vagina and anus. If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. The shocker (see above) accomplishes this using several fingers of one hand. Simultaneous penetration of the mouth and either the vagina or anus. If the penetrating objects are penises, this is sometimes called the spit roast, the Chinese finger trap, or the Eiffel tower. Number of positions, and effects on physical abilities In 1974, Alex Comfort categorized more than 600 and Gershon Legman categorized 3,780. However, the suggestion that the number of positions that can be used for sex is essentially limitless also exists. Some people are limited by physical disabilities in the sex positions which they may use without pain or other discomfort. Other physical limitations of one or both participants also limit the sex positions which they may adopt. For example, the spoons