Analysis of results showed the glans of the uncircumcised men had significantly lower thresholds than that of circumcised men (P = 0.040). There were also significant differences in pressure thresholds by location on the penis (p < 0.0001). The most sensitive location on the circumcised penis was the circumcision scar on the ventral surface. It was remarkable that five locations on the uncircumcised penis that are routinely removed at circumcision had lower pressure thresholds that the ventral scar of the circumcised penis.
This study suggests that 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. It appears that circumcision ablates the most sensitive parts of the penis.
You poor souls.
http://www.sciencedaily.com/releases/2007/06/070627144210.htm