Threesome or 3some pornography features one man and two women . On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Swinging can take place in various contexts, ranging from a spontaneous sexual activity at an informal social gathering of friends to a regular social gathering in a sex club or residence. The use of the word creampie nude milfs to describe such scenes originated in U. Concerted deployed sexual rejection exercised on the partner can be an aspect of Dominance and Submission as well. Real school shots or videos which are sexualized may violate privacy laws in some countries. Crush pornography features objects being crushed hentai movies by an actress or actor, who generally plays an overtly dominant role. The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. The Girls gay sex video Gone Wild series is one example. Such documents have not been recognized as being legally binding, nor are they intended to be. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. The study also found that participants reacted positively to a much wider range of figures than a control group, even rating emaciated figures higher.