Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Examples include the Girls Gone Wild hot gay sex and Girls Who Like Girls Series. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. Actual upskirt or downblouse shots may violate privacy laws in some countries. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, hentai movies and so perform autofellatio. Some do not use the diapers at all, for arousal, or bladder and bowel movements. Comic books often featured characters being tied up and tying others up, particularly in damsel in distress plots. Its primary goal is sexual arousal in its audience. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. 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. Double Stuffed lesbian milfs , Double Vaginal , or Double Anal pornography involves the penetration of one orifice by two penises or other objects. Since development and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth.