Actual upskirt or downblouse shots may violate privacy laws in some countries. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in gay twink porn primates. The Silent Duck, also called Duck-Billing, is the technique often used in which the person engaging in hand insertion shapes the hand to resemble a duck beak. There were also a very limited number of specialist fetish magazines which featured images of bondage, such as the famous Bizarre magazine published from 1946 to 1959 by the pioneering fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. The wife who enjoys cuckolding her husband is frequently called a hotwife, or a cuckoldress if the man is more submissive. Stimulating the nude milfs prostate from outside, via pressure on the perineum, can be pleasurable as well. First found in softcore movies and erotic thrillers, depictions of lesbianism entered hentai movies mainstream cinema in the 1980s. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation. 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 shot. Sadomasochism does not imply enjoyment through causing or receiving pain in other situations . Bobbi S. This may relate to fetishes such as voyeurism or cuckolding. Generally, interest differs between people, and gender depends on sexual orientation. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. Starting with erotic stories and woodblock prints from before the 20th century, Japanese pornography evolved into distinct subcategories with the media that in addition of pornographic videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime .