The foreskin is either present or absent. For research purposes, doctors have proposed five types of foreskins:
Normal Foreskin (retractable foreskin)
Redundant Prepuce (adhered foreskin)
Partial Prepuce (where childhood foreskin separates partially)
Phimosis (childhood foreskin does not separate at all)
Circumcised Foreskin (Foreskin has been removed)