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This observation is somewhat off:
<<Male circumcision typically does not destroy sexual function -- it isn't designed to stamp out a man's sexual pleasure or identity.>>
It may not destroy sexual function but it absolutely does decrease the sensitivity of the penis, since the foreskin was "designed" to cover and protect the glans. The exposed head becomes de-sensitized, how could it not? Ask men who were circumcised as adults. And in the 19th century, circumcision was a treatment for masturbation, meant to decrease interest by decreasing sensitivity.