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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.
Some of the positions below are popular positions for sex during pregnancy. It may be penetrative or non-penetrative, and may take place before, during, as, or following intercourse.
Sex acts may also involve other forms of genital stimulation, such as solo or mutual masturbation, which may involve rubbing or penetration by the use of fingers or hands or by a device (sex toy), such as a dildo or vibrator. There are numerous sex positions that participants may adopt in any of these types of sexual intercourse or acts; some authors have argued that the number of sex positions is essentially limitless.
The most used sex position is the missionary position.
When the receiving partner is a woman, these positions are sometimes called the woman on top, cowboy or cowgirl positions.
A feature of these positions is that the penetrating partner lies on their back with the receiving partner on top: Most sex acts are typically performed on a bed or other simple platform.