If one person is penetrated by two objects, it is generically called double penetration . Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. Hentai narrow Japanese usage and broad international usage are often incompatible. This genre also features male-on-male fellatio through a small hole made in a bathroom divider. This is commonly called double vaginal penetration or double stuffing. Certain websites have begun providing bondage videos and photographs featuring the kidnapping roleplay, which has been largely the hallmark of detective style bondage magazines. This makes varying degrees of stimulation an integral part of oral sex for many men. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Older names gay movies for a pornographic film include stag film, and blue hentai porn movie. 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 big tit milf the giver. However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Works in this genre may be considered adult for any number of reasons. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. At the end of the evening the female partners would randomly select keys from the bowl and leave with that key owner.