sentences:  Types of mutual masturbation include the handjob (the manual sexual stimulation of the penis or scrotum by a person on a male) and fingering (the manual sexual stimulation of the vagina, clitoris or other parts of the vulva, by a person on a female).Sexual stimulation of the genitals by using the feet may also be included, and so may manual stimulation of the anus.Like frottage in general, mutual masturbation may be used as an alternative to penile-vaginal penetration, to preserve virginity or to prevent pregnancy.