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It's called Adam and Eve, and it can certainly make you understand how the human race got going. I'm more qualified to speak about the male figure, which is one of the most erotic I've seen in mainstream art, but both are wows. The story goes that Lempicka, in France at the time, was looking for a male model for Adam, and, in her own words (courtesy of Edward Lucie-Smith's excellent Art Deco Painting):
In the street nearby I saw a gendarme, a policeman on his beat. He was young, he was handsome. I said to him: "Monsieur, I am an artist and I need a model for my painting. Would you pose for me?" And he said, "Of course, Madame, I am myself an artist. At what time do you require me?" We made arrangements. He came to my studio after work and said: "How shall I pose?" "In the nude." He took off his things and folded them neatly on a chair, placing his big revolver on the top.
Be still my beating heart!