Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. In the lesbian hentai 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. The existence of such content in commercially available pornography is widely considered an urban legend. The term bondage describes the practice of Physical restraining. 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. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. In Japan, point of view pornography is referred to as hamedori . Cuckolding can also be mixed with other non-monogamous relationship arrangements with which it has substantial overlap such as Swinging, wife-swapping, open relationships, and polyamory, etc. Portrayals of lesbians in the media suggest big tit milf that society at large has been simultaneously intrigued and threatened by women who challenge feminine gender roles, and fascinated and appalled with women who are romantically involved with other gay boy porn women. 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. The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions.