Gonzo pornography is a style of pornographic film that attempts to place gay hentai the viewer directly into the scene. See also Gay-for-pay. Those with diaper-related paraphilias differ widely in their focus of attention. Top and dominant are widely recognized for those partner in the relationship or activity who are, respectively, the physically active or controlling participants. As well as traditional attraction, the topic also incorporates feederism and gaining, where sexual gratification is obtained via the process of gaining body fat. In the West, masturbation in private or with a partner is generally considered a normal and healthy part of sexual enjoyment. These styles are much closer to the style of bondage scenes in mainstream television. Some men enjoy masturbating during pegging. Threesome or 3some pornography features one man and two women . The introduction of the home video and Internet saw a boom in the worldwide porn industry that generates billions of dollars annually. Following the introduction of the Motion Picture Association of America film rating system, independent momporn animation producers attempted to establish an alternative to mainstream animation. Most bisexual porn is made by small production companies rather than the major studios. Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. While some fantasize about a giantess who is slightly taller than himself, others are interested in giantesses that are hundreds or even thousands of feet tall. Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. Lolita pornography that features actual teenage girls under the age of 18 is illegal in most countries and treated as child or youth pornography. Today, pornographic films can be sold or rented gaysex on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters.