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.

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.
Male Reproductive System Men’s reproductive systems may be more complicated than you think. This article explains and illustrates the male reproductive system.
Masturbation Is masturbation normal? Is it harmful? This article provides answers to these and other questions about masturbation.
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.
Video: Human Pheromones: Our Love Scents This video explores human pheromones -- sex scents that may sway sexual attraction.
Sexual Orientation Heterosexuality, homosexuality and bisexuality are three types of sexual orientation. This article is an overview of sexual orientation.
Why People Have Sex One? Two? Twenty? Some people cite as many as 237 different reasons for having sex. Are yours listed here?
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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