Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. Many men who like trans partners of any variety, known as tranny chasers, do not necessarily identify as gay themselves. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. There is no singular or archetypical behavior; therefore, a wide range of thought patterns and behaviors exist, but all tends to be a harmless and efficacious release from some kind of pressure. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. It is suggested that much of the obscurity and the uncertainties about female ejaculation are related to mixing up these two gay fuck phenomena. Examples of heterosexual pornographic film series featuring creampies include Cream Filled Teens and Internal Cumbustion. The other person may do the same during or after. Such explicit sexual interaction is seen only rarely in public play spaces, and it is sometimes specifically mature milfs banned by the rules of a party or playspace. Some techniques which may work for one individual can be difficult or uncomfortable for another. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. Adult animation is genre of animation geared towards adults and sometimes teens. The wife who enjoys cuckolding lesbian hentai her husband is frequently called a hotwife, or a cuckoldress if the man is more submissive. 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. It is used, for example, at fertility clinics to stimulate sperm donors. Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them.
