Incest itself is largely taboo, and is a crime in many countries. Foot fetish pornography features heavy gaysex emphasis hentai movies on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism. Pregnancy fetishism is a context where pregnancy is seen by individuals or cultures as an erotic phenomenon. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. 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 . If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. Is also common of milf fuck the furry genre. 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. The smotherbox is placed on a stable surface. The other person may do the same during or after. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . They further argue that setting a discrete line between safe and not-safe activities ideologically denies consenting adults the right to evaluate risks vs rewards for themselves; that some adults will be drawn to certain activities regardless of the risk; and that BDSM play—particularly higher-risk play or edgeplay—should be treated with the same regard as extreme sports, with both respect and the demand that practitioners educate themselves and practice the higher-risk activities to decrease risk. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. Preggo pornography features pregnant performers and may include erotic lactation as a fetish.