As so often with Heinrich Kley art, you wonder about the meaning behind the illustration.
Depicted here is a female nude presumably flirting with an oversized semi-nude man, while riding a rhinoceros.
Unlike Frazetta's sexually charged drawings and paintings, Kley's nudes always look innocent and wholesome.
I believe that for this watercolor drawing he just let his mind meander, perhaps starting the illustration at one point without knowing what the final result might look like.
In any case, this Kley is a feast for the eyes.