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Testosterone: 13 Surprising Facts

First Posted: 12/18/11 11:43 AM ET Updated: 12/19/11 11:07 AM ET

By Anne Harding

When most people hear the word testosterone, they think of aggressive behavior. There is a link between the two -- at least in competitive situations, such as with a peer or for a sexual partner.

However, there appears to be a subtler interplay between testosterone and behavior in other types of situations -- in both men and women.

Here are a few facts about the "male hormone."

Women In Love Have More
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Women in love have higher testosterone for the few months after a relationship starts than women who are single or in long-term relationships, a small Italian study suggests. The opposite is true for men; those newly in love have lower testosterone than men flying solo or with a long-term partner.

As with early passion, though, the changes don't last. When the researchers tested the study participants again one to two years later, the differences had disappeared.

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Filed by Sarah Klein  |