Irrespective of the legal or social view of pornography, it has been used in a number of contexts. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. This genre also features male-on-male fellatio through a small hole made in a bathroom divider. A person may be sexually penetrated multiple times simultaneously. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. Standing up, a chair, the corner of an item of furniture, or even a washing machine can be used to stimulate the clitoris through the labia and clothing. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Many fantasies include the macrophile shrinking before a normal sized woman or keeping his or her normal height while the partner grows in size. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. Barebacking usually porno gay refers to a conscious and deliberate choice to forgo condoms. Pornographic films are typically categorized as either softcore or hardcore pornography. Certain websites have begun providing bondage videos and photographs featuring the kidnapping roleplay, which has been largely the hallmark of detective style bondage magazines. The niche popularity grew significantly in the latter half of the first decade of the 2000s. Content featuring male bisexuality has been a growing trend since the advent of internet pornography. The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction. There is, however, no third party camera work involved. Mammary intercourse is known as titty-fucking, titfuck, or a titjob in the United States, as well as tit wank or French fuck in the United Kingdom - the latter term dating back to the 1930s; while a more jocular equivalent is a trip down mammary lane.