I recently was reading a really well put together article about circumcision...they had an excellent depiction of the difference in sensitivity between and intact and a circumcised penis. Also some great info on the function of the foreskin and why its not just an erroneous "flap of skin"
heres the chart if you dont feel like reading the whole thing:
a seriously comprehensive list of tons of peer reviewed scholarly articles regarding adverse affects of circumcisions. basically has every argument every made for anti circ plus a ton more lol