Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses . Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. In recent years, however, many celebrities have benefited from the publicity resulting from the release of a sex tape. These actors gaysex often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel Ami models. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. Yuri : Featuring two grown adult women in a homosexual/lesbian relationship. The name was coined from the title naked milf of the controversial book. To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream or saliva during masturbation. Standing up, a chair, the corner of an item of furniture, or even a washing machine can be used to stimulate the clitoris through the labia and clothing. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. Some people hentai videos get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Such ejaculation can be done by mammary intercourse, or masturbation over the other person, or result from the withdrawal of the penis from a partner mouth as he is ejaculating following fellatio, irrumatio, or intercourse. Concerted deployed sexual rejection exercised on the partner can be an aspect of Dominance and Submission as well.