In human sexuality, a threesome is sexual activity that involves three people at the same time. Men may find stimulation of the anus, hentai videos rectum, and adjacent organs enjoyable. The nipples are erogenous zones, and vigorous stimulation of them during masturbation usually causes the penis to become erect more quickly than it would otherwise. The term discipline describes psychological restraining, with the use of rules and punishment to control overt behavior. Pornography in the early 2000s. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to gay movies urinate. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. There may be more than two participants; both group sex and gang banging can be included. Real enema shots or videos of true medical situations may violate privacy laws in some countries. It is commonly depicted in pornography, but very rarely in mainstream cinema. Simultaneous penetration of the mouth and either the vagina or anus. The person sat upon may be in bondage, big tit milf sexually submissive, or simply held down by the body-weight of the other person. Most soft crush fetishists avoid being placed under the same label as hard crush fetishists, believing that crush films with larger animals give the entire group a bad label. As of 2013, little analysis of this paraphilia has been reported in medical literature. A facial is a form of non-penetrative sex, though it is generally performed after some other means of sexual stimulation, such as vaginal sex, anal sex, oral sex or masturbation. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent.