Gustav Klimt (July 14, 1862 – February 6, 1918) was an Austrian Symbolist painter and one of the most prominent members of the Vienna Secession movement. His major works include paintings, murals, sketches, and other art objects. Klimt's primary subject was the female body, and his works are marked by a frank eroticism. --Wikipedia
Not really sure if I agree with the description of the paintings as "frank eroticism"...implied, perhaps, or just as open as other artists have always been. Perhaps the interpretation of eroticism is connected to the undulation of line and composition that was common in his works.
More impressive I've always thought was his ability to create works that look like he used gold leaf when he simply used oils.