Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . For much of the history of cinema and television, lesbianism was considered taboo, though since the 1960s it has increasingly become a genre in its own right. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. 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. Common positions include lying on videos porno gay back or face down, sitting, squatting, kneeling or standing. Dwarfs or midget mobile porn sites pornography features performers who are dwarfs/midgets. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single gay hentai shot. Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the gay twink porn subject of a juvenile novel called Rainbow Party. Some may keep their hand stationary while naked milf pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. A sex party is a gathering at which sexual activity takes place. The arousal from being desperate comes from the sensation of having a full bladder. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. Sexual relations between women have been illustrated as well as narrated, but much of the written material from the early modern period has been destroyed. The smotherbox is placed on a stable surface. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Cuckold fetish pornography that involves a cuckolded husband. Usually that person prefers to stage the wetting so that his/her legs become soaked with urine.