A dilator for dilating the tissue of a corpora cavernosum of a penis. The dilator includes a handle, a stem and an intermediate portion connecting the handle and the stem. A dilation portion includes an exterior surface defining a groove configured to leave at least one section or segment of the tissue in the corpora cavernosum undisturbed and un-dilated. A kit of parts including a dilator and a penile prosthetic insert is also disclosed.
