The term sadomasochism is derived from the words momsex sadism and masochism . 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 also known colloquially as gushing or squirting, although these are considered to be different phenomena in some research publications. Men may also rub or massage the glans, the gay cock rim of the glans, and the frenular delta. Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the hentai porn sexually performing model head. Sexual orientation Pornography features an increasing variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. Threesome can also refer to a love triangle, a three-way romantic relationship. For example, in Australia it is rated Refused Classification . Examples include the Girls Gone Wild and Girls Who Like Girls Series. Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, but for pregnancy as well. Dwarfs or midget pornography features performers who are dwarfs/midgets. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. However, bisexual pornography is often placed near the gay section in adult video stores, since many consumers are gay men. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Creampie scenes depart from heterosexual pornographic convention in favor of a depiction that more closely mimics sexual intercourse as performed in ordinary life; they have been called the counterimage of facials.