http://www.eurekalert.org/pub_releases/2004-10/uoc-rfc100604.php

Researchers find chemosignal that encourages women's sexual desire

Breastfeeding women and their infants produce a substance that increases
sexual desire among other women, according to research at the University of
Chicago.

"This is the first report in humans of a natural social chemosignal that
increases sexual motivation," said Martha McClintock, the David Lee
Shillinglaw Distinguished Service Professor in Psychology at the University,
and the lead researcher in a team at the University's Institute for Mind and
Biology. Chemosignals are substances that while not necessarily perceived as
odors, nonetheless have an impact on mood and menstrual cycles when absorbed
through the nose.

The researchers found that after being exposed to the breastfeeding
compounds for two months, women with regular partners experienced a 24
percent increase in sexual desire as reported on a standard psychological
survey. Women without partners experienced a 17 percent increase in sexual
fantasies after exposure for the period.

<snip>
see link above for rest  of article.

Janice Reynolds

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