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. Lesbianism in erotica deals with depictions in the visual arts of lesbianism, which is the expression of female-to-female naked milf sexuality. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Cum shots typically do not appear in girl-girl scenes and orgasm is normally implied by utterances, cinematic conventions, or body movement. In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently in pornography is a different phenomenon, the expulsion of clear and abundant fluid, which has been shown hentai movies to be a diluted fluid from the urinary bladder. Gay pornography is the representation of sexual activity between males. The word shibari came into common use in the West at some point in the 1990s to describe the bondage art Kinbaku. Gonzo pornography is a style of pornographic film that attempts to place the viewer directly into the scene. A scene where many women have sex with one man is referred to as a reverse gang-bang. Felching is a sexual videos gays practice involving the act of orally sucking semen out of the vagina or anus of one partner. Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an index or middle fingers, or both. According to columnist Dan Savage, the person whose scrotum is being stimulated is known as the teabagger and the teabaggee is the one giving the stimulation: A teabagger dips sack; a teabaggee receives dipped sack. The resulting consent and understanding is occasionally summarized in a written contract, which is an agreement of what can and cannot take place. Voyeurism is the sexual interest in or practice of spying on people engaged in intimate behaviors, such as undressing, sexual activity, or other actions usually considered to be of a private nature.