With second wave feminism and growth of scholarship in women history and sexuality in the 20th century, the definition of lesbian broadened, sparking a debate about sexual desire as the major component to define what a lesbian is. One-sided male nudity can also arise when a male disrobes as part of a male striptease. Dogging is a British English slang term for engaging in sexual acts in a public or semi-public place or watching others doing so. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. Pegging is a recently invented word which features a woman penetrating a man with a strap-on dildo. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. This is commonly hentai movies called double anal or double stuffing. 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. Gang bang pornography is a type of pornography that depicts an individual engaging in physical sexual activity with multiple partners sequentially or at once. The fetish centers around this fantasy portrayal. 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. Fisting involves the insertion of gaysex one partner entire hand into a vagina or the anal cavity. It is practiced by people of all sexual orientations, and can be part of a full repertoire of sexual activity. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. They are most often featured milf fuck with male partners, but are also featured with other transsexuals or cissexual women.