Dwarfs or midget pornography features performers who are dwarfs/midgets. Bondage pornography specializes in the depiction of porn milf sexual bondage or BDSM activities as photographs, stories, movies, or drawings. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. Many cultures describe pain as an aphrodisiac. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. There is, however, no third party videos gays camera work involved. Women oriented pornography is sometimes referred to as sex positive pornography. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. Typically featured are hitting, choking, name-calling and hair-pulling. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. If dramatic skills are not involved, a performer in a porn film may also be called a model. This may help them develop their orgasm, increase its pleasure, and may inspire them to masturbate on a more frequent basis. It is sometimes combined with BDSM features. Oral sex pornography frequently features a person performing hentai porn fellatio, and less frequently cunnilingus. In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. The object or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M.