The term hentai is never used in this context in Japanese. Pornography is generally classified as either softcore or hardcore pornography. Others involve partners who naturally have a significant difference in size. Incest pornography can feature actual relatives, but the main type of this pornography simply uses actors of similar looks to suggest family relationship. 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. Currently, animated television series aimed at adults gay fuck are some of the most popular and critically acclaimed forms of entertainment. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . Since at least 1973, it has also been used to refer to a sexually attractive young woman. Watersports pornography features sexual activities involving urine, such as golden showers. The stigma of being gay or labeled as such has steadily eroded since the Stonewall riots began the modern American gay rights movement in 1969. It is commonly depicted in pornography, but very rarely in mainstream cinema. Big Beautiful Woman is a euphemism for an overweight mature milfs woman and is frequently used in the context of fat hentai sex fetishism. In addition to mainstream pornography, the popularity of facials has led to creation of its own niche market, like video series that specialize in showing the act. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. Amateur porn has been called one of the most profitable and long-lasting genres of pornography. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create.