Dear Cooldwarf,

Erection happens during arousal — one of the phases of the sexual response cycle. A number of changes in the body happen during this phase.

In both girls and guys, the heart begins to beat faster and blood pressure rises. The muscles in the body grow tense, and the nipples may get hard. People with light complexions may have what's called a "sex flush" — they redden around the chest and neck.

Increased blood flow to the genitals will cause a guy's penis to become erect, and guys will notice their testicles drawing closer to their body as the scrotum thickens. In girls, breasts enlarge, the vagina lubricates, and the clitoris begins to swell.

The penis and the clitoris are very similar. They're both made of spongy erectile tissue and are full of sensitive nerve endings. The penis extends out from the body for several inches. The clitoris extends into the body for several inches.. So, much like men, women get erections, too. But they're not so noticeable from the outside.

Hope this information helps!

Take care,

teenwire.com^® Editors

This column is for informational purposes only and is not intended to constitute medical advice, diagnosis, or treatment. If you have a medical problem, please call toll-free 1-800-230-PLAN for an appointment with the Planned Parenthood health center nearest you.