Rape pornography features performers simulating rape. It contains graphic sexual activity and visible penetration. Many cultures describe pain as an aphrodisiac. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place anime hentai at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Throughout history, women have not had the same freedom or independence to pursue homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. The term pearl necklace is used by some because the drops of porn milf semen deposited by the man resemble a necklace of translucent white pearls. Some women who engage in same-sex sexual activity may reject not only identifying as lesbians but as bisexual as well, while other women self-identification as lesbian may not align with their sexual orientation or sexual behavior; sexual identity is not necessarily the same as one sexual orientation or sexual behavior, due to various reasons, such as the fear of identifying their sexual orientation in a homophobic setting. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that gay twinks readily distinguish it from western pornography. BDSM communities generally welcome anyone with a non-normative streak who identifies with the community; this may include cross-dressers, extreme body mod enthusiasts, animal players, latex or rubber aficionados, and others. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. 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.