The glans of the circumcised penis is less sensitive to ﬁne touch than the glans of the uncircumcised penis. The transitional region from the external to the internal prepuce is the most sensitive region of the uncircumcised penis and more sensitive than the most sensitive region of the circumcised penis. Circumcision ablates the most sensitive parts of the penis.
from the study “Fine-touch pressure thresholds in the adult penis” (Sorrells ML, Snyder JL, Reiss MD, et al. “Fine-touch pressure thresholds in the adult penis”. BJU Int 2007;99:864-9.)