I haven&#x27;t seen this (my) theory mentioned but it&#x27;s worth thinking about- sculptors of fine art were keen to differentiate themselves from poor cheap carvings that you can still get to this day in cheap markets in rural towns on the european continent. Go through stalls in Spanish seaside towns and you&#x27;ll immediately find lewd phalic sculptures. They are made to shock the person receiving the gift. Proper artists wanted to go in the other direction, reducing the size of the genitalia so it&#x27;s not a focus of the work.