Many fantasies include the macrophile shrinking before a normal sized woman or keeping his or her normal height while the partner grows in size. Common positions include lying on back or face down, sitting, squatting, kneeling or standing. Diaper fetishism is totally porn milf independent from pedophilia as the wearer derives pleasure only from the diaper and/or use of it. 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. Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. In POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. The term is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction. Real medical shots or videos may violate privacy laws in some videos gays countries. In Japanese, this natural-fibre rope is known as asanawa; hentai videos the Japanese vocabulary does not make a distinction between hemp and jute. If dramatic skills are not involved, a performer in a porn film may also be called a model. A woman can use a secondary vibrator, between the dildo and her genitals, to get pleasure from pegging. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. The most common male masturbation technique is simply to hold the penis with a loose fist and then to move the hand up and down the shaft.