Lolita pornography that features actual teenage girls under the age of 18 is illegal in most countries and treated as child or youth pornography. Works in this genre may be considered adult for any number of reasons. Milking pornography features lactating women being milked or milking themselves . 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. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. The genre presents itself as real couples having real sex. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra gay sex video , a practice known as urethral play or sounding. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. 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. Yaoi is anime or manga that features hentai porn gay males . 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. Such documents have not been recognized as being legally binding, nor are they intended to be. Reading or viewing pornography, sexual fantasy or other erotic stimuli may naked milf lead to a desire for sexual release such as by masturbation.