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This book consists of twenty-two chapters, including sex history and culture, the analysis and function of sexual organs, sex and procreation, human's sexual reaction and action, sexual psychological development and gender, homosexual, love and marriage, sexual psychological dysfunction, sexual dysfunction, sexual disease, Aids, medicine and sex, domestic education of sex, school education of sex, social education of sex, partner education of teenagers, sexual morality, sexual assault on children and teenagers, sex and law, sexual aesthetics and common sexual probelms (forty cases).