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. They may repeat this cycle multiple times. In places where non-monogamous sex is taboo or illegal, group sex may take place in private or clandestine locations including homes, hotel rooms, or private clubs. Fisting involves the insertion of one partner entire hand into a vagina or the anal cavity. In September 2003 the BBC reported videos gays on the new dogging craze. Along with the penis, the scrotum is sensitive and considered to be an erogenous zone. The speed of the hand motion will vary from person to person, although it is not uncommon for the speed to increase as ejaculation nears and for it to decrease during the ejaculation itself. In recent years, Japanese films of this genre have become more common in the USA and Europe although it still remains a small, fetish-oriented part of the adult film industry. Anti-pornography 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. Practitioners have described going to public places such as a mall or a park. Cum-shot pornography features a collection of male ejaculation scenes. Others involve partners who naturally have a significant difference in size. The fetish centers around gay hentai this fantasy portrayal. Bodily functions Menstrual or red rhapsody pornography features sexual activities involving women who are menstruating, with a focus on the menstrual blood. The meaning big tit milf of hentai is perversion, abnormality, or metamorphosis. Fetish cuckolding can have a wide range of expression, from pillow-talk fantasy between monogamous partners to extreme alternative lifestyles, depending on the couple. The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship.