Rainbow parties were covered on The Oprah Winfrey Show in 2003, and became the subject of a juvenile novel called Rainbow Party. Lying face down on a comfortable surface such as a mattress or pillow, the penis can be rubbed against it. Both sexes sometimes apply lubricating substances to intensify sensation. Pornographic films are typically categorized as either softcore or hardcore pornography. The term Asiaphile is sometimes used to describe the same phenomenon as is yellow fever . Some men also enjoy anal stimulation, with fingers or otherwise, without any prostate stimulation. The use of the word creampie to describe such scenes originated in U. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. This gay twink porn industry employs thousands of performers along with support and production staff. Concerted deployed sexual rejection exercised on the partner can be an aspect of Dominance and Submission as well. Advocates of RACK argue that SSC can hamper discussion of risk because no activity is truly safe, and that discussion of even low-risk possibilities is necessary for truly informed consent. Threesome can also refer to a love triangle, a three-way romantic relationship. Tentacle erotica hentai porn can be consensual, but frequently contains elements of non-consensual sex. Films with risqué content commenced to be produced soon after the porn milf invention of the motion picture in the 1880s. Mammary intercourse is known as titty-fucking, titfuck, or a titjob in the United States, as well as tit wank or French fuck in the United Kingdom - the latter term dating back to the 1930s; while a more jocular equivalent is a trip down mammary lane.