I can tell you the non circumsized liked sex a lot more; seemed to enjoy it a lot more. I never felt his private part was dirty or smelly; so much for the cleanliness factor. The circumsized penis looks prettier but the man in question does not seem to like sex as much. Maybe a coincidence.
I myself think it is a barbaric old fashioned habit. I never understood why American families choose that (the Judaic influence)?
In South America nobody does that.
Female circumcision: no comments. Absurd.
Now, this article was a surprise for me in the sense I had no idea that men could lose some sensitivity.