Since development and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol lesbian hentai of youth. Most soft crush fetishists avoid being placed under the same label as hard crush fetishists, believing that crush films with larger animals give the entire group a bad label. For legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. There is also some evidence that pornography can be used to treat voyeurism. The rise of the Internet in the late 1990s and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. Actual upskirt or downblouse shots may violate privacy laws in some countries. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. Pornographic films present sexual fantasies and usually include erotically stimulating material momporn such as nudity. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred to by the term breeding or the reverse money shot. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. Along with the penis, the scrotum is sensitive and considered to be an erogenous zone. In the 1970s, the hardcore pornography genre introduced the stereotypical young gay porn cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. As in B/D, the declaration of the Top/Bottom may be required, though sadomasochists may also play without any Power Exchange at all, with both partners equally in control of the play.