Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. 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. Throughout history, women have not had the same freedom or independence to pursue homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. 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. Yuri female hot gay sex homosexual hentai. Some anthropologists and sociobiologists believe that breast fetishism derives from the momsex breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. Compensating elements of the total dominance and submission are care and devotion complementing one another, thus facilitating stable relationships. The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed hentai movies either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M. The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility.