Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. New York photographer Irving Klaw also published illustrated adventure/bondage serials by fetish artists Eric Stanton, Gene Bilbrew, Adolfo Ruiz and others. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it momsex does not represent a genre of work. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Commenting on why there are not as many female macrophiles, psychologist Helen Friedman theorized that because women in most societies already view men as dominant and powerful, there no need for them to fantasize about it. Boots are seen as the perhaps most fetishistic of all footwear and boots may be the most popular fetish clothing attire. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within gaysex the consensual scenario. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. They may be noted for using risqué themes, graphic violence, sexuality or black comedy in a manner that is unsuitable for younger audiences. Portrayals of lesbians in the media suggest that society at large has been simultaneously intrigued hentai sex and threatened by women who challenge feminine gender roles, and fascinated and appalled with women who are romantically involved with other women.