The secret of small penises on ancient statues

Satyrs were shown with large, erect genitals because they represented drunkenness and a total lack of self-control, the opposite of the ideal Greek man. Artists used exaggerated size to mark someone as animalistic or foolish, so the comparison reinforced why modest, smaller genitals stood for reason and discipline instead.

Both are true at once. The statues show flaccid, resting genitals rather than erect ones, and on top of that, sculptors deliberately made them smaller than average, since flaccid and modest-sized bodies together signaled a calm, disciplined mind rather than lust or excess.

Yes, largely. Roman sculptors kept the small, proportionate penis as the standard for their own statues of gods and elite men, even though Roman culture was generally more open about large genitals and sexuality in everyday life. High art still followed the older Greek convention for centuries.

Not for a single lesson on its own. Nibble groups lessons into units and full courses, and it's finishing one of those that earns you a certificate, so this lesson simply counts toward that larger goal rather than granting a credential by itself.