Why People Have Sex

When children ask why people have sex, they often hear about love and expanding on that love by starting a family. Those reasons for sex are pretty accurate, although they leave out some of the finer points [more…]

What Is Sex? What "Counts" as Sex?

What is sex, exactly? In other words, what "counts" as having sex? And when do you stop being a virgin? Sexual relations cover activities beyond intercourse: They also include outercourse, oral sex, and [more…]

What Happens during Sexual Intercourse

Heterosexual intercourse occurs whenever a man puts his penis into a woman’s vagina. That’s the minimal definition. But sex is about more than that simple act. As such, you may be curious, or you may want [more…]

Sexual-Response Cycle: How Bodies Respond during Sex

The sexual response cycle is, essentially, a clinical version of how a human body responds during sex. By examining thousands of examples, scientists are able to carefully describe the events that happen [more…]

How to Know If You're Ready for Sex

What's the right age to start having sex? When to start having intercourse (or any other type of sex) is a very difficult and serious decision to make. Some people believe you must wait until you're married [more…]

Why Safe Sex Is Important

Often, safe sex messages are geared toward younger people — but sexually active people of all ages should be aware. Safe sex is about taking precautions: Sexual intercourse with someone of the opposite [more…]

Anatomy of the Human Penis

Knowing how a penis functions can provide useful insight into sex and the human body — whether you want to understand the penis and male anatomy better or learning about it for the first time. [more…]

The Human Vagina and Other Female Anatomy

Understanding women's sexual (or reproductive) organs such as the vagina, uterus, and vulva is as integral to sex as understanding the penis. Demystifying female anatomy is key to good sexual functioning [more…]