Originally posted by: Noriaki
http://net.indra.com/~shredder/intact/anatomy/
(There are some pictures at that link that may be NSFW...but they are medical oriented not porn-oriented, I apologize if they are seen as inappropriate)
A few things:
One: There are many nerves in the foreskin. I would not say this is comparable to so called "female circumcision", but many pleasure nerves are lost in a circumcised male.
Two: The "skin" on the glans of an uncircumcised penis does callous or get rougher, in fact there is no skin on the glans. Uncircumcised penises grow a thin layer of keratin to protect them. Does this reduce sensitivity? Possibly...but without having two penises personally with which to compare I don't feel confident making that assessment.
Three: One of the foreskin's functions is to stimulate the female g-spot. Does this cause women to be more likely to orgasm? Hell if I know, but there it is.
On the other hand, this is a website, so what good are they really as a source of information? About as good as un-peer-reviewed "studies".