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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. 

Birds & Bees

How much do you know about women’s reproductive system? This article provides descriptions and drawings of the female reproductive system.

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

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

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.

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

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

Sex & Relationship Facts

One? Two? Twenty? How about 200? Some college students have cited as many as 237 different reasons for having sex.

There are many reasons why people in long-term relationships find themselves reaching for the pillow or the remote control instead of their partner's body after the sun goes down.

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