Sexual relations between women have been illustrated as well as narrated, but much of the written material from the early modern period has been destroyed. Bondage/BDSM Bondage pornography features performers tied up or constrained in various ways. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. A sex party is a gathering at horny milfs which sexual activity takes place. The Silent Duck, also called Duck-Billing, is the technique often used in which the person engaging in hand insertion shapes the hand to resemble a duck beak. Foot fetishism gay movies has been defined hentai movies as a pronounced sexual interest in the feet or footwear. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Rape pornography features performers simulating rape. Both sexes sometimes apply lubricating substances to intensify sensation. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. Portrayals of lesbians in the media suggest 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 women. The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M. Sigmund Freud considered foot binding as a form of fetishism. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging in anal sex than homosexual and bisexual men. Those with diaper-related paraphilias differ widely in their focus of attention. Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions.