This study answers the big question about whether circumcision reduces sensitivity of the penis. The answer was no.
They did both:
“We directly tested whether circumcision is associated with a reduction in penile sensitivity by testing tactile detection, pain, warmth detection, and heat pain thresholds at multiple sites on the penis between groups of healthy circumcised and intact men.
“This study indicates that neonatal circumcision is not associated with changes in penile sensitivity and provides preliminary evidence to suggest that the foreskin is not the most sensitive part of the penis.”
Researchers also found that the foreskin had similar sensitivity to forearm skin.
Glad I wasn't a part of that study
Why did they check the foreskin for sensitivity? Isn't it what the foreskin protects that should be tested?