Real jail or prison or police station shots or videos may violate laws in some countries. A large part of the popularity of these videos is seeing how regular and normal the girls are in real-life. Freud, however, considered such extensions of sexual interest to fall within the range of gay movies the normal, unless marked out by exclusivity . Initially, few animation studios in the United States attempted to produce animation for adult audiences, but later examples of animation produced for adults would gain mainstream attention and success. Softcore pornography generally contains nudity or partial nudity in sexually suggestive situations, but without explicit sexual activity, sexual penetration or extreme fetishism, while hardcore pornography may contain graphic sexual activity and visible penetration, including hentai porn unsimulated sex scenes. Along with the penis, the scrotum is sensitive and considered to be an erogenous momsex zone. Strictly speaking, bondage means binding the partner by tying their appendages together; for example, by the use of handcuffs or by lashing their arms to an object. 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. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. Lesbian pornography made for women is usually made by women, and usually features women who identify as lesbian or bisexual. It may be used as foreplay, or as an alternative to sexual penetration. Twink pornography features younger performers, and usually features young men under 30 who identify as gay or bisexual. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake.