Although there may be no connection between coprophilia and sadomasochism , the limited data on the former comes from studies of the latter. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. Boots are seen as the perhaps most fetishistic of all footwear and boots may be the most popular fetish clothing attire. Studies among BDSM practitioners in the US have shown that about half of all men find the idea of bondage to be erotic; many women do as well. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. The slave is usually strictly forbidden from placing their lips directly on the body of the dominant so the practice routinely involves them receiving much of the spray all over their face, hair and body, however, another way of doing this that applies mostly to male dominants, is to place the mouth on the head of the penis and drink the urine as it is released. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Those with diaper-related paraphilias differ widely in their focus of attention. However, gay pornography in the modern world is mostly concentrated in the making of home videos , cable broadcast and emerging video on demand and wireless markets, as well as images and movies for viewing on the Internet. It is typically animated pornography, as the legal age lesbian milfs to be featured in a pornographic film in Japan is 18. Certain websites have begun providing bondage videos and photographs featuring the kidnapping roleplay, which has been largely the hallmark of detective style bondage magazines. A smotherbox gives a more dramatic lesbian hentai experience . Perhaps following the example set by gay pornography, they have become gay fuck a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations.