MUTUAL MASTURBATION
Mutual masturbation is the act of two or more people stimulating each other's genitals.  (Mutual masturbation by men is sometimes referred to as a “circle jerk.”)

Mutual masturbation can also involve a partner(s) watching as another person stimulates him or herself. This form of sexual activity – which is common in both intimate heterosexual and homosexual relationships – may continue until orgasm for one or both partners is reached, or as foreplay for intercourse.

Mutual masturbation can be an important activity for individuals who wish to abstain from intercourse, or who have a hard time reaching orgasm through intercourse.  Women, in particular, often report that they enjoy mutual masturbation prior to or following intercourse in order to achieve orgasm.

With the advent of the internet, a new form of mutual masturbation has developed. Using computer cameras and conferencing software, people have started to masturbate while watching eachother do the same.