Lesbian pornography typically features a wider range of appearances and body types than is hentai sex typical of naked celebrities mainstream pornography. A celebrity can fight the mature milfs release in court to maintain deniability while still enjoying the career benefits. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent celebrity sex videos pregnancy. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage videos porno gay in anal sex animated porn and that it is not uncommon in heterosexual relationships. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. Detective magazines, comic books and early fetish magazines In the early 20th century, Detective magazines covertly provided a way of publishing bondage imagery. Is also common of the furry genre. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12. Testosterone discourages fat storage in these areas. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. Bondage websites and bondage imagery in mainstream pornography As of 2003, specialist bondage magazines were mostly displaced by the availability of bondage material on the World Wide Web, and the presence of bondage imagery in mainstream pornographic magazines such as Nugget and Hustler Taboo magazine. Both sexes sometimes apply lubricating substances to intensify sensation. Buttocks are sometimes emphasized in pornography, where they are often referred to as booty.