Gay pornography is the representation of sexual activity between males. 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. Swinging can take place in various contexts, ranging from a spontaneous sexual activity at an informal social gaysex gathering of friends to a regular social gathering in a sex club or residence. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. The niche popularity grew significantly in the latter half of the first decade of the 2000s. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. Creampie, also known as internal cum shot, and, in homosexual contexts, also known as breeding and seeding, is a slang term used in pornography to describe when lesbian milfs a male ejaculates inside his partner vagina or anus. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . Some hentai movies people masturbate by using machines that simulate intercourse. In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently in pornography is a different phenomenon, the expulsion of clear and abundant fluid, which has been shown to be a diluted fluid from the urinary bladder.