Female ejaculation is the expulsion of fluid by the paraurethral ducts through and around the human female urethra during or before an orgasm. Normal quantities of ejaculate range from 1.5 to 5.0 milliliters . Shibari is a Japanese word that literally means to tie or to bind. Pornographic films present sexual fantasies and usually include erotically stimulating material such as nudity. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. The range of its individual characteristics is thereby wide. Both forms of pornography generally contains nudity. When sexual activity is centered on one of the threesome, then the activity may be described as a gang bang of the person. Within a BDSM or D/s context, facesitting can be an especially intense form of erotic humiliation. For uncircumcised males, stimulation of the penis in this way comes from the pumping of the foreskin, in which the foreskin is held and slid gay twinks up and down over the glans, which depending on foreskin length, is completely or partially covered and then uncovered in a rapid motion. Klaw ran an international mail-order business out of his store, Movie Star News, selling cheesecake pinups and bondage/spanking photos. In pornography, lesbian hentai depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being.