Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. Biological anthropologist Helen B. When used as an alternative to penile-vaginal penetration, the goal may anime hentai be to preserve virginity or to prevent pregnancy. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. It is also followed by dedicated industry publications and trade gay boy porn groups as well as the mainstream press, private organizations , government agencies, and political organizations. The term has origins in the Greek language . Such documents have not been recognized as being legally binding, nor are they intended to be. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. They signal the presence of estrogen and the presence of sufficient fat stores for pregnancy and lactation. Those with diaper-related paraphilias differ widely in their focus of attention. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, but during the 20th century, these taboos generally declined. Mammary intercourse has sometimes been considered a perversion. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. A spanking may be carried out with the use of a bare or gloved hand, or with any of a variety horny milfs of implements, including a paddle, strap, hairbrush, feather duster or belt. Cum shots typically do not appear in girl-girl scenes and orgasm is normally implied by utterances, cinematic conventions, or body movement. The resulting consent and understanding is occasionally summarized in a written contract, which is an agreement of what can and cannot take place.