Evidence would be hard to find. This is a politicized subject to put it mildly. What I say is purely my own experience. And NS only selects for items preventing reproduction. It doesn't get that bad.
the human prepuce is not "vestigial" but is, in fact, an evolutionary advancement over the prepuce of other primates. This is most clearly seen in the evolutionary increase in corpuscular innervation of the human prepuce...
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...and the concomitant decrease in corpuscular receptors of the human glans relative to the innervation of the prepuce and glans of lower primates." http://www.cirp.org/library/anatomy/cold-mcgrath/ …
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