A person may be sexually penetrated multiple times simultaneously. The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. Irrespective of the legal anime hentai or social view of pornography, it has been used in a number of contexts. However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Works in this genre may be considered adult for any number of reasons. A related term used in the genre is the term cougar, which implies an older woman as predator. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. Exhibitionism: Becoming noticeably desperate or wetting oneself with the express purpose of being seen by strangers. Behind the Green Door was one of the first pornographic films to feature sex between a white actress with a black actor . Works in this genre may explore philosophical, political or social issues. Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, set up and precede sexual encounters. The volume of semen that is ejaculated depends on several factors, gay movies including the male health, age, degree of sexual excitement, and the time since his last ejaculation. Boots are seen as the perhaps most fetishistic of all footwear and boots may be the most popular fetish clothing attire. Some people get sexual pleasure by inserting objects, such as momsex urethral sounds, into the urethra , a practice known as urethral play or sounding.