Fisting involves the insertion of one partner entire hand into a vagina or the anal cavity. Group sex can occur between people of all sexual orientations and genders. Lesbian pornography made for women is usually made by women, momsex and usually features women who identify as lesbian or bisexual. 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. Squirt pornography involves women hentai videos ejaculating. He talked to them extensively on camera so that both he and the viewer can come to know them before any sex scenes. In some societies, the terms fox, plum, chick, or chicken are preferred. Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them. Can also include auto-fellatio, or performing oral sex on oneself. When all regions of the face are included, facial cum shots comprise approximately 62% of scenes where external ejaculation occurs. Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. 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. The term hentai is never used in this context in Japanese. Group gay sex video sex is sexual behavior involving more than two participants. This is commonly called double anal or double stuffing. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. This style of filming is in contrast to having a separate, third-person camera crew filming all the action.