A scene where many women have sex with one man is referred to as a reverse gang-bang. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. In humans, females generally have more round and voluptuous buttocks, caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. Testosterone discourages fat storage in these areas. However, gay pornography in the modern world is mostly concentrated in the making of home videos , cable broadcast and emerging video on demand and wireless markets, as well as images and movies for viewing on the Internet. Most bisexual porn is made by small production companies rather than the major studios. Masturbation is the self-sexual stimulation porn milf of the anime hentai genitals for sexual arousal or other sexual pleasure, usually to the point gay boy porn of orgasm. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. The naked appearance of actress Demi Moore in the advanced stage of pregnancy on the cover of Vanity Fair magazine in 1991 marked the beginning of a period which has since seen pregnancy presented by celebrities as a glamorous state of living, while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists to introduce pregnancy styling to their business. In recent years, however, many celebrities have benefited from the publicity resulting from the release of a sex tape. Nevertheless, it is only an attempt at phenomenological differentiation. The term has origins in the Greek language . 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.