Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. Spanking or whipping pornography involves spanking or whipping, generally of the buttocks, with the hand or with other objects such as belts, switches, paddles, brushes, or whips. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. Scenes of multiple penetration are common in pornography. See Gay-for-pay. Through the 1990s, mainstream movie and television actors have been more willing to portray homosexuality, as the threat of any backlash against their careers has lessened and society acceptance of gay and lesbian people has increased. Others may also use vibrators and other sexual devices gay fuck more commonly associated with female masturbation. Squirt pornography involves women ejaculating. Japanese rope bondage is distinguished by its hentai porn use of specific katas and aesthetic rules. The nipples are erogenous zones, and vigorous stimulation of them during masturbation usually causes the penis to become erect more quickly than it would otherwise. While most tentacle erotica is animated, there are also a few live-action movies. Sub-genres of Japanese porn Among the various sub-genres of Japanese pornography are the following: Lolicon ロリコン: This genre involves prepubescent and adolescent girls between the aged of 6-12. Sexual scenarios may involve momsex male domination, female submission, exhibitionism and erotic entertainment. Amateur porn has been called one of the most profitable and long-lasting genres of pornography. As observation is encouraged, voyeurism and exhibitionism are closely associated with dogging. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself.