Le Dejeuner Sur l'Herbe

This question is not very politically correct, maybe, so I ask those very sensitive persons: do not look at the picture below and do not read the text.

This question does not make me sleep for a week.

Here you see a picture of the famous "father of Impressionism", Édouard Manet
The Luncheon on the Grass (Le déjeuner sur l'herbe), 1863, that I copied from Wikipedia.
I adore Impressionists, specially Pierre-Auguste Renoir . Their pictures are so as I see the world. :-)

But when I look at this picture, I think every time: WHY (why, I repeat) the men on this picture are completely dressed (even with jackets and hat) and the women are without clothes!!!