Actually, you rarely see Greek goddesses nude. Only Aphrodite was regularly portrayed nude, the rest had their clothes on, and quite prim and proper mind you! A woman portrayed in art in a state of undress or in a sexually compromising position was generally a
hetairai (a high class prostitute), not a proper wife - wives who were to bear citizen children were betrothed in arraigned marriages, kept cloistered and separate from the men, other than family or their husband. And clothed from neck to toe.
(I'm talking about the Athenians here, the Spartans were a bit different about dress and social morals between men and women)
Portrayal of male nudity was quite common, though.
2004. Online posting (by Robin “bijou”) on nudity in a Greek Mythology forum.