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    Just the Facts

    This chapter is Sex Ed and Relationships 101. Get key facts and statistics on the biology of sex, sex and happiness, America’s “best” marriage age, and more. 

    1. Human Sexual Response

      1. Human Sexual Response

        It’s no secret that men and women react differently to sexual stimulation and sex. But do you know why? This article explains the male and female human sexual response.

      2. Female Reproductive System

        How much do you know about a woman’s reproductive system? This article provides descriptions and drawings to help you familiarize yourself with the female reproductive system.

      3. Male Reproductive System

        Men’s reproductive systems may be more complicated than you think. This article explains and illustrates the male reproductive system.

      4. Masturbation

        Is masturbation normal? Is it harmful? This article provides answers to these and other questions about masturbation.

      5. Video: Human Pheromones: Our Love Scents

        This video explores human pheromones -- sex scents that may sway sexual attraction.

      6. Sexual Orientation

        Heterosexuality, homosexuality, and bisexuality are three types of sexual orientation. This article is an overview of sexual orientation.

    2. Getting in the Mood

      1. Getting in the Mood

        There are many reasons people in long-term relationships may find themselves reaching for the pillow or the remote instead of their partner's body. Find out what can help. 

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