I don't know how I didn't come across docking until now, but I'm so glad I did.
Note: Avoid googling "magnified view of a ridged band" if you can.
Smegma is a word that makes people throw up in their mouths, but I'm here to tell you that smegma is a most beautiful thing.
Smegma has the reputation of being gross stinky dick cheese. But actually, both males and females produce smegma. For both sexes it is a whitish substance composed of shed skin cells and oily secretions. In men you'll find it on the glans (dick head) and under the foreskin, and for ladies it lurks between the labia and around the clitoris.
Rather than being the product of bad hygiene*, smegma is actually clean, healthy, and beneficial. It moisturises, lubricates and protects your precious genitals.
*please still wash your genitals
While the outer foreskin is a continuation of the shaft skin, the inner foreskin is more like the inside of an eyelid as it's a mucous membrane.
The inner foreskin is only visible when the foreskin is retracted (pulled back), which occurs naturally with a boner.