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.

Men’s reproductive systems 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 types of sexual orientation. This article is an overview of sexual orientation.

One? Two? Twenty? Some people cite as many as 237 different reasons for having sex. Are yours listed here? 

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.