Female masturbation techniques include a woman stroking or rubbing her vulva and her clitoris, with her fingers. Sometimes one or more fingers may be inserted into the vagina to repeatedly stroke its frontal wall where the g-spot is located. Masturbation aids such as a vibrator or dildo can also be used to stimulate the vagina and clitoris. Many women caress their breasts or stimulate a nipple with the free hand, if these are receptive areas for sexual stimulation. Anal stimulation is also enjoyed by some. Common positions include lying on back or face down, sitting, squatting, kneeling or standing. In a bath or shower a female may direct tap water at her clitoris and vulva. Lying face down one may use the hands, one may straddle a pillow, the corner or edge of the bed, a partner's leg or some scrunched-up clothing and "hump" the vulva and clitoris against it. Standing up a chair, the corner of an item of furniture or even a washing machine can be used to stimulate the clitoris through the labia and clothing. Some masturbate using only pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing.