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"Views about the sexual component of marriage as set out in dominant discourses of gender and sexuality since 1949 have consistently been premised on two core principles. Whether offered in official publications, journals, or advice booklets to newlyweds, explanations of the sexual response and responsibilities of the married couple have first of all assumed that legally recognized monogamous marriage is the only legitimate framework for sexual relations. Advice about what are considered appropriate sexual attributes, needs, and responses in women (or men) is framed by the assumption that a [person’s] relationship is with their [spouse], their exclusive and lifelong sexual partner. Legitimate sexual conduct continues to be defined with reference to the legally recognized heterosexual relationship” (Evans, 342).
And we think the Chinese are backwards? Interesting.