Bear features a combination of middle-aged, hairy or overweight males. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. The niche popularity grew significantly in the latter half of the first gay movies decade of the 2000s. If one person is penetrated by two objects, it is generically called double penetration . In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, but during the 20th century, these taboos generally declined. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. A celebrity can fight the release in court to maintain deniability while still enjoying the career benefits. Content featuring male bisexuality has been a growing trend since the advent of internet pornography. Sigmund porn milf Freud considered hentai videos foot binding as a form of fetishism. In 1988, a sex tape caused significant damage to Rob Lowe career. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. Sadism describes sexual pleasure derived by inflicting pain, degradation, humiliation on another person or causing another person to suffer. Real school shots or videos which are sexualized may violate privacy laws in some countries. Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. This is commonly called double vaginal penetration or double stuffing. A related term used in the genre is the term cougar, which implies an older woman as predator. Femdom features BDSM scenes in which the dominant partner is female. During anal sex, male pleasure can be particularly derived from the prostate, which can lead to an orgasm and ejaculation.