The head of the penis is a very sensitive area... so how do you walk around all day with it rubbing against your underwear (or trousers, you brave soul[s]) and not get turned on, if not completely numbed by the sensation after, I dunno, several hours?
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It's really no big deal. Circumcised men generally [url=http://en.wikipedia.org/wiki/Circumcision#Adverse_effects]do not[/url] have reduced sensation in their penises. I guess you get used to it.