Anti-pornography hamster mobile porn psychologist Ana Bridges and colleagues conducted a content analysis of best-selling heterosexual pornographic videos showing that over 96% of all scenes concluded with a male performer ejaculating onto the body of his female partner. Studies indicate that anilingus is a rare sexual practice between women. Common phrases used to refer to these individuals are chicks with dicks, trannies, or shemales, although these are generally considered pejorative slurs among transwomen. This is also the case in many relationships not considering themselves as sadomasochistic; it is considered to be a part of BDSM if it is practiced purposefully. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . Simultaneous penetration of the vagina and anus. Hamedori-type videos were produced from the beginnings of Japanese AV in the early nude milfs 1980s. A large part of the popularity of these videos is seeing celebrity porn how regular and normal the girls are in real-life. High heel pornography involves women gay sex video videos gays or men dressed in high heeled hentai sex shoes. Technically this is a form of exhibitionism rather than group sex per se. In the United States, creating, distributing, or possessing crush videos has been illegal since 1999, and many other countries also have banned them. The Japanese sex industry uses the term Paizuri . Bodily functions Menstrual or red rhapsody pornography features sexual activities involving women who are menstruating, with a focus on the menstrual blood. Partners can engage in penetrative sex, known as full swap, or choose cartoon porn pics to soft swap in which they engage only in non-penetrative sex. Bondage is usually, but not always, a sexual practice. The terms can be complimentary or pejorative. As of 2010, they were reported to live together as a monogamous couple outside of their porn careers and want to continue working together for another 50 years. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face.