I'm not sure. Not well versed in the nature of prosphetic limbs, phallic or otherwise. Though I did read in the telegraph though a few years back, an article called "the life and times of Liberace" where it stated taht once a week he had to smear a pipe cleaner with jif and insert into the penis hole to keep it well oiled. Other than that I have no other knowledge on Liberace's metallic winky.