Mutual masturbation is a sexual act in which two or more people manually stimulate their own genitals or their partner's genitals.
More About Mutual Masturbation
Some more common acts employed during mutual masturbation include hand jobs and fingering. Some individuals may also use toys like vibrators and masturbation sleeves. Both homosexual and heterosexual couples and groups can engage in mutual masturbation.
This practice is often used before a couple feels emotionally ready to have intercourse but still wants to experience sexual stimulation together. Mutual masturbation can also be used during foreplay.