Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . It contains graphic sexual activity and visible penetration. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. 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. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Compensating elements of the total dominance and submission are care and devotion complementing one another, thus facilitating stable relationships. The actual height of gaysex the giantess within the fantasy may vary depending on the individual. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998. It is also known colloquially as gushing or squirting, although these are considered to be different phenomena in some research publications. The porn industry and hentai videos viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise undetected horny milfs in a semi-public place, usually a toilet cubicle at a pub, hotel, restaurant, theatre/cinema, office, club etc. Use of the agreed safeword is seen by some as an explicit withdrawal of consent.