However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political gay twinks organizations. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Some masturbate 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. Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. A study of the condom usage habits of New Zealand horny milfs sex workers said that they offered various safe sex alternatives to vaginal sex to clients lesbian hentai who refused to wear a condom. Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses . Typically featured are hitting, choking, name-calling and hair-pulling. Both sexes sometimes apply lubricating substances to intensify sensation. Yuri : Featuring two grown adult women in a homosexual/lesbian relationship. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. It contains graphic sexual activity and visible penetration. The current public acceptance of celebrities with sex tapes is speculated by Joe Levy, executive editor of Rolling Stone, to be due to the easy availability of pornography, as well as couples more commonly making their own tapes due to the prevalence of video cameras.