The Silent Duck, also called Duck-Billing, is the technique often used in which the person engaging in hand insertion shapes the hand to resemble a duck beak. It is also known colloquially as gushing or squirting, although these are considered to be different phenomena in some research publications. 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. The term sadomasochism is derived from the words sadism and masochism . Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Normal quantities of ejaculate range from 1.5 to 5.0 milliliters . Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions. Fisher said porn milf that perhaps, the fleshy, rounded videos gays buttocks attracted males during rear-entry intercourse. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise undetected in a semi-public place, usually a toilet cubicle at a pub, hotel, restaurant, theatre/cinema, office, club etc. It contains graphic sexual activity and visible penetration. If dramatic skills are not involved, a performer in a porn film may also be called a model. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. In 1988, hentai sex a sex tape caused significant damage to Rob Lowe career.