Pornography can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc., as well as the types of sexual activity featured. There is some evidence on the Internet that the craze has begun to spread to other countries, such as the United States, Canada, Ireland, Australia, Barbados, Brazil, the Netherlands, Denmark, Norway, Poland, Sweden. Regardless of its origin, BDSM is used as a catch-all phrase to include a wide range of activities, forms of interpersonal relationships, and distinct subcultures. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. These typically are leaked to the public via the Internet, with or without the celebrity consent. In the United States, creating, distributing, or possessing crush videos has been illegal since 1999, and many other countries also have banned them. The other is in the top of the box to expose their face. Bukkake videos are a relatively prevalent niche in contemporary pornographic films. BDSM has become an umbrella term for certain kinds of erotic behavior between consenting adults. Studies indicate that anilingus is a rare sexual practice between women. Unlike Yaoi, Bara is normally made by actual homosexual men, for homosexual men, and tends to focus on the more realistic obstacles hot gay sex and challenges that come with being homosexual in Japan. In straight pornography, intercourse is often followed by a facial, pearl necklace or other visible ejaculation. This is commonly called double anal or double hentai videos stuffing. Sexual scenarios may involve male domination, female submission, exhibitionism and erotic entertainment. Partners can engage in penetrative sex, known as full swap, or choose to soft swap in which they engage only in non-penetrative sex. Others involve partners who naturally have a significant difference in size. The Japanese horny milfs sex industry uses the term Paizuri . In male homosexual pornography, Treasure Island Media is a notable representative, its title Breed Me having been noted as one of the earliest and most notorious in the genre.