I can't believe I had never seen that "strategic" bit of cloth before. My eyes always go to the bottom of the girl on the "bottom."
And I know this painting well. I have seen it since I was little at the Clark Art Institute in Williamstown, MA (a wonderful museum, with many Renoirs, Monets, Sargents, Homers, etc.). The photographic realism always blew me away: especially the "special effects" of the satyr. That was before I grew up and saw the sexism of the whole thing. (Yeah, I know; I'm not a strong feminist, but this does indeed portray women as only sex objects....)