The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. Usually that person prefers to stage the wetting so that his/her legs become soaked with urine. Cuckolding can also be mixed with other non-monogamous relationship arrangements with which it has substantial overlap such as Swinging, wife-swapping, open relationships, and polyamory, etc. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs gay fuck but now also includes professionally made pornography designed to appear as if it were amateur. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. For legal reasons, the vast majority of so-called reality porn momsex involves professional actors and actresses posing as so-called amateurs. Normal quantities of ejaculate range from 1.5 to 5.0 milliliters . Each participant may engage in any type of sex acts with one or both of the others, such as vaginal, anal or oral sex or mutual masturbation. Some do not use the diapers at 3d hentai all, for arousal, or bladder and bowel movements.