In humans, females generally have more round and voluptuous buttocks, hot gay sex caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. 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; lesbian hentai while a more jocular equivalent is a trip down mammary lane. Today, religions vary in gaysex their views of masturbation; some view it as a spiritually detrimental practice, some see it as not spiritually detrimental, and others take a situational view. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Women with women Main article: Lesbianism in erotica: Lesbianism in contemporary pornography Lesbian or girl-girl pornography features women engaged in sex together, but is typically aimed at a male audience. Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. No causal relationship is known between masturbation and any form of mental or physical disorder. It is geared towards heterosexual men, who most lesbian milfs typically define a threesome as such. Unlike the usual power neutral relationships and play styles commonly followed by couples naked celebrities , activities and relationships within a BDSM context are often characterized by the participants taking on complementary, but unequal roles; thus, the idea of informed consent of both the partners becomes essential. Hentai narrow Japanese usage and broad international usage are often incompatible. 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. Cum shots typically do not appear in girl-girl scenes and orgasm is normally implied by utterances, cinematic conventions, or body movement.