For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . 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. 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. The name was coined from the title of the controversial book. Irrespective of the legal or social view of pornography, it has been used in a number of contexts. Lying milf fuck face down on a comfortable surface such as a mattress or pillow, the penis can be rubbed hentai videos against it. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . Content featuring male bisexuality has been a growing trend since the advent of internet pornography. Typically featured are hitting, choking, name-calling and hair-pulling. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, hot gay sex and political organizations. Hentai narrow Japanese usage and broad international usage are often incompatible. The strategies and tactics that are used to smuggle one of the couple into and out of the toilet undetected are as important or almost as important as the urination. 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. The cover can have hinges or be a separate part.