Since discovering I was pregnant with a baby boy & taking on the task of researching circumcision, I have talked to many circumcised men who have dealt with painful erections because "too much" foreskin was removed. That is one of many problems with circumcision-- there is no way to tell how large a baby's penis will grow in adulthood, so removing too much foreskin is common. Removing ANY foreskin at all is a problem. The following photo illustrates how necessary the foreskin is to have a normal erection: