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This is a list of movie studios that produce pornographic (or "adult") films. In addition to more straightforward sexual intercourse, films feature a wide variety of themes—sado-masochism (S&M), bondage and discipline (BDSM), anal sex, catfighting, bukkake, or group sex, for example. There is a wide range of film quality, ranging from amateur films to those with professional, high end production values.
As with the mainstream film industry, using VHS cassette tapes for product releases has transitioned to using DVDs. Films may be purchased or rented online, at "brick and mortar" retail outlets, or through mail order services. Internet downloads and streaming videos are also becoming more popular with the availability of increased internet access speeds.
Homosexual or Gay pornography by definition is any pornography (porn) that contains male same-sex activity; however, the performers may or may not themselves be gay. Bisexual porn differs from gay porn as it also contains female or transgendered performers (and may contain both) with sexual activity between any combination of performers.