How Viagra, Levitra, and Cialis Work

loveandhealth 2006-11-01

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How Viagra, Levitra, and Cialis Work

By Annette Owens, M.D., Ph.D.

Medical Aspects of Human Sexuality
HSAB Affiliation: Professional Advisor.

http://www.loveandhealth.info
http://www.hsab.org
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