Threesome or 3some pornography features one man and two women . Reality pornography is a genre of pornography where staged scenes, usually shot milf fuck in cinéma vérité fashion, set up and precede sexual encounters. His most famous model was Bettie Page, who became the first naked celebrities celebrity of bondage film and photography. Buttocks are sometimes emphasized in pornography, where they are often referred to as booty. Works in this genre may be considered adult for any number of reasons. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Lesbian pornography typically features a wider range of appearances and body types than is typical of mainstream pornography. These gay bear porn are often fake. The Girls Gone Wild series is one example. Exhibitionism: Becoming noticeably naked celebrities desperate or wetting oneself with the express purpose of being seen by strangers. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. 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. A related term used in the genre is the term cougar, which implies an older woman as predator. The volume of semen that is ejaculated depends on several factors, including the male health, age, degree of sexual excitement, and the time since his last ejaculation. See also Gay-for-pay. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. Following World lesbian hentai War II, during a period of social celeb gossip repression when governments actively persecuted homosexuals, women developed networks to socialize with and educate each other. Commenting on why there are not as many female macrophiles, psychologist Helen Friedman theorized that because women in most societies already view men as dominant and powerful, there no need for them to fantasize about it.