The naked appearance of actress Demi Moore in the advanced stage of pregnancy on the cover of Vanity Fair magazine in 1991 marked the beginning of a period which has since seen pregnancy presented by celebrities as a glamorous state of living, while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists to introduce pregnancy styling to their business. Pornographic films are typically categorized as either softcore or hardcore pornography. In the 18th and nude milfs 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, but during the 20th century, these taboos generally declined. A celebrity can fight the release in court to maintain deniability while still enjoying the career benefits. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. Most bisexual porn is made by small production companies rather than the major studios. Breast fetishism is a paraphilic sexual interest focused on female breasts . As women, they face concerns separate from men. By comparison, gonzo pornography puts the camera right into the action, often with one or more of the participants both filming and performing sexual acts, without the usual separation between camera and performers seen in conventional porn and cinema. Today, religions vary in their views of masturbation; some view it as a spiritually detrimental practice, some see it as not spiritually detrimental, and others take a situational view. Testosterone discourages hentai porn fat storage in these areas. Some straight actors have started acting in gay porn only to be accused of being gay while others first step was to strictly do solo scenes. In the West, masturbation in private or with a partner is generally considered a normal and healthy part of sexual enjoyment. Biological anthropologist Helen B. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties.