Although macrophilia literally translates to simply a lover of large, in the context of a sexual fantasy it is used to mean someone who attracted to beings larger than themselves. In D/S, the Dominant is the Top and the submissive is the Bottom. As most porn hentai movies is marketed to men, most bisexual porn is marketed to heterosexual or bisexual men. Bondage is usually, but not always, a sexual practice. 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. Studies indicate that anilingus is a rare sexual practice between women. It is also often mixed with other fetishes in practice, gay twinks such as voyeurism, denial, etc. A glory hole is a hole in a wall, or other partition, often between public lavatory stalls or adult video arcade booths for people to engage in sexual activity or observe the person in the next cubicle while one or both parties masturbate. Incest pornography is a genre of pornography involving the depiction of incest . Other popular implements are canes, riding crops, whips, switches, birches, sneakers, rolled-up newspapers, rulers or martinet. 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. Cum shots have become the object of fetish genres like bukkake. If the penetrating objects are penises, this is sometimes called the spit roast or the Chinese finger trap. Hamedori-type videos were produced from the beginnings of Japanese AV in the early 1980s. Technically this is a form of exhibitionism rather than group sex per se. Typically big tit milf features a feminine Uke, or submissive, and a masculine Seme, or dominative. Actors are mostly amateur; any well-known actors in bisexual porn tend to be from the gay pornography industry.