I believe David was as handsome as the statue carved by Michelangelo.. . . But it's unsettling that you were so fixated on it that you noticed a nuance that suggests of quasi-pornographic interest, focus, and examination.
Btw, Moses had to be threatened before he was circumcised. And in some senses David is more Trumpian than Moses. I can imagine David keeping every little bit of an organ he never took for granted. Just ask Bathsheba. She would know.
And that's what matters.
The Italian artist had no idea what circumcision was because Jews have always been very secretive about their practices.