Does Circumcision Cause Erectile Dysfunction?
http://www.thewholenetwork.org/14/post/2011/08/does-circumcision-cause-erectile-dysfunction.html

Acquisition of Erectile Dysfunction from Circumcision
http://intactnews.org/node/138/1319461990/acquisition-erectile-dysfunction-circumcision

Does circumcision cause erectile dysfunction (ED)?
http://www.torontosun.com/life/healthandfitness/2010/03/18/13277631.html

Is circumcision the reason we need Viagra?
http://www.canadafreepress.com/medical/urology030302.htm

Erectile Dysfunction Evaluation after Circumcision
http://www.ncbi.nlm.nih.gov/pubmed/14979200

What is keratinization? (graphic)
http://www.noharmm.org/IDcirc.htm#keratinization

Foreskin, Circumcision & Sexuality
http://www.circumstitions.com/Sexuality.html

A change in how intercourse works
http://www.drmomma.org/2009/10/change-in-how-intercourse-works.html

Book: Sex As Nature Intended It 
http://astore.amazon.com/savingpenises-20/detail/0970044216

Book: The Rise of Viagra
http://astore.amazon.com/peacefparent-20/detail/081475211X

Book: The Joy of Uncircumcising
http://astore.amazon.com/savingpenises-20/detail/093406122X

How Male Circumcision May Be Affecting Your Love Life 
http://www.coloradonocirc.org/pamphlets.php  

Sexual side effects 
http://www.boystoo.com/medical/conversion.htm  
http://www.norm.org/lost.html  
http://www.notjustskin.org/ 

From the Journal of Urology
http://www.cirp.org/library/sex_function/fink1/

Fine-touch pressure thresholds in the adult penis 
http://www.nocirc.org/touch-test/bju_6685.pdf