It may also involve touching, rubbing, or pinching the nipples or other erogenous zones while masturbating. Hentai is the various forms of Japanese pornography, including H-manga, H-anime, and H-computer games. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. These scenes hentai porn may either have the cameraman directly engaging in sex or merely filming others having sex. Depictions of male and female masturbation are common in pornography, including gay pornography. While bondage is a very popular variation within the larger field of BDSM, it is nevertheless sometimes differentiated from the rest of this field. Each participant may engage in any type of sex acts with one or both of the others, such as vaginal, anal or oral sex or mutual masturbation. If ejaculation is onto the other person face it can be called a facial. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person anus, or anus and rectum, for sexual pleasure. Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. Emetophilia pornography involving vomiting momporn and gagging. The first film was released in 1980 starring Kay Parker. Shemale is a term primarily used in sex work to describe a trans woman with male genitalia combined with female secondary sex characteristics, usually including augmented female breasts, from breast augmentation and/or use of hormones. Men and women may masturbate until they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. Simultaneous penetration of the mouth and either the vagina or anus. English adopts and uses hentai as a genre of pornography by the commercial videos porno gay sale and marketing of explicit works under this label.