A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Voyeurism is the sexual interest in or practice of spying on people engaged in intimate behaviors, such as undressing, sexual activity, or other actions usually considered to be of a private nature. The term bondage describes the practice of Physical restraining. Such documents have not been recognized as being legally binding, nor are they intended to be. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. On the other hand, the masochist enjoys being gaysex hurt, humiliated, or suffering within the consensual scenario. Some prefer a particular type of clothing to urinate. Some people masturbate by using machines that simulate intercourse. The neologism pegging was popularized when it became the winning entry in a contest in Dan Savage Savage Love sex advice column, held after an observation was made that there was no common name for the act. The loose and direct camera work often hentai porn includes nude milfs tight shots of the genitalia, unlike some traditional porn. 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. A study of 164 males in Finland from two SM clubs found that 18.2% had engaged in coprophilia; 3% as a sadist, 6.1% as a masochist, and 9.1% as both. 18% of heterosexuals and 17% of homosexuals in the study pool had tried coprophilia, showing no statistically significant difference between heterosexuals and homosexuals.