A mucocutaneous zone is a region of skin comprising both mucosa and cutaneous skin. These mostly occur near the orifices of the body at which the external skin stops and the mucosa that covers the inside of the body starts.
Winkelmann reported the mucocutaneous boundary is a "specific erogenous zone with rete ridges where the nerve endings rise closer to the surface."
- Winkelmann RK. The erogenous zones: their nerve supply and significance. Mayo Clin Proc 1959 Jan 21;34(2):39-47. PMID 13645790 Full Text