He liked his models big.
Ok, for some reason the Devil never has a penis in Western art.
But there's no excuse for Pogany's depiction of Amfortas in the German epic Parsifal without a penis.
One might expect the advertising layout for Mohawk Rugs to feature Native Americans, but no, it's a harem of Middle Eastern boys.
Pogany was also interested in the female form. His art instruction books all have naked women on the covers, and he illustrated Pierre Louys' Songs of Bilitis (1926), poems in praise of the lesbian poetess Sapho. Del Martin borrowed its title for the first lesbian organization in the U.S., The Daughters of Bilitis.
Also some heterosexual erotic art -- but even there, his men lack penises.
In fact, I was able to find only one penis depicted in all of his oeuvre. Sort of:
See also: Why the Devil Has No Penis