Fingering is the practice of using fingers to stimulate the clitoris, vagina or anus. Along with manual stimulaton of the penis, it is the most common form of mutual masturbation. To "finger oneself" is to masturbate in this manner.

Digital penetration is penetration (for example sexual penetration), with one or more fingers.

Vaginal fingering (also known as manual stimulation) may or may not end in orgasm; it also may or may not constitute the entire sexual encounter. It may be part of foreplay or part of a precursor to other sexual activities. These activities can provide sexual pleasure to a partner when penetrative intercourse is not possible or desirable

Fingering the G-spot is a commonly cited method which can often lead to spontaneous female ejaculation. This release of fluid can range significantly in quantity and force of expulsion, varying from woman to woman and also varying with different scenarios for each woman. The fluid following a G-spot ejaculation is released from the urethra but is not urine, as its contents do not come in contact with those of the bladder at any stage. This female ejaculate contains antibodies only found in the male prostate; leading to speculation it is a residual prostate. Similarities are sometimes drawn with the fingering or other manipulation of the male prostate through the anus.

Fingering of the anus and rectum is commonly enjoyed in preparation of further anal sex. Anal fingering can arouse the receiver, allowing them to relax their anus and prepare them for the insertion of a penis or a dildo.

Anal fingering is an effective way of stimulating the prostate gland of males, and thus bringing the receiver to orgasm. Anal fingering can also stimulate the G-spot in women, through the wall separating the rectum from the vagina. Anal fingering is commonly enjoyed by both same sex and heterosexual couples.