Animal masturbation has been observed in many species, both in the wild and in captivity. There may be more than two participants; both group sex and gang banging can be included. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses . Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness. Target audience are teenage / young adult women. Other objects such as ball point pens and thermometers are sometimes gay hentai used, although this practice can lead to injury and/or infection. The existence of such content in commercially available pornography is widely considered an urban legend. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise undetected in a semi-public place, usually a toilet cubicle at a pub, hotel, restaurant, theatre/cinema, office, videos gays club etc. Double Stuffed , Double Vaginal , or Double Anal pornography involves the penetration of one momporn orifice by two penises or other objects.