From the influence of the devil to overzealous restorers, there are numerous strange reasons and theories behind the conspicuous lack of pubic hair on women depicted in Western art.
You know how Roman statues were actually painted bright colors? In ancient times pubes were actually glued onto the groins of sculpted figures, unfortunately with weathering over time most of these sculptures lost their pubes
Most statues were actually far more lifelike and often brightly colored when originally created; the raw stone surfaces found today is due to the pigment being lost over the centuries.