There's definitely a bit of full frontal in the final scene.I watched it on a platform - can’t remember which - not in the cinema and I don’t recall a full frontal, just sort of sideways and rear view with hints. Did they cut it for the streaming version? I wondered what all the hooha was about.
Talking of prosthetic privates in Hollywood, Willem Dafoe's own little Willem is rumoured to be so large that directors have always used body doubles, because the real thing would be distracting and not look genuine.