How Viagra, Levitra, and Cialis Work

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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

1 comment

Thank-you for the very thorough and insightful explanation.
By Mr Manface December