A study of the condom usage habits of New Zealand sex workers said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom. New York photographer Irving Klaw also published illustrated adventure/bondage serials by fetish artists Eric Stanton, Gene Bilbrew, Adolfo Ruiz and others. The queening stool is also related to a smotherbox, which also allows the person under the seat to be locked in place, restrained by the neck as in a set of stocks. Works in this milf fuck genre may be considered adult for any number of reasons. Pornographic films are typically categorized as either softcore or hardcore pornography. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. Cum shots typically do not appear in girl-girl scenes and orgasm is normally 3d hentai implied by utterances, cinematic conventions, or body movement. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. Gonzo pornography is a style of pornographic film that attempts to place the viewer directly into the scene. In Japan, point of view pornography is referred to as hamedori . Exhibitionism: Becoming noticeably desperate or wetting oneself with the express purpose of being seen by strangers. Certain websites have begun providing bondage videos and photographs featuring the kidnapping roleplay, which has been largely the hallmark of detective style bondage magazines. This is commonly called double vaginal penetration or double stuffing. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. The resulting consent and understanding is occasionally summarized in a written contract, which is an agreement of what can and cannot take place. Some masturbate gaysex only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver.