Willem de Kooning at Hirshhorn
There is a contrast between the delicacy of the dessein of de Kooning and his dreadful women. On one side, poetry of lines and colors, on the other side provocative vulgarity and ugliness. I wouldn't be surprised to find in one of his works a case of vagina dentata.
Art critics have explained to us that in his depiction of women de Kooning gave voice to sexual dreads that are deeply nested in our subconscious.
Well, de Kooning is far from being the only master in the twentieth century to challenge us with terrifiant visions (Mihail Ralea has a study on the Ugliness in Art) ; I'd like to add something else regarding the works of de Kooning: his roads back and forth between abstract and figurative are fascinating.