Sartre and Beauvoir had met in Paris in 1929, when he was twenty-four, she was twenty-one, and both were studying for the agrégation, the competitive examination for a career in the French school system. Beauvoir was a handsome and stylish woman, and she had a boyfriend, René Maheu. (It was Maheu who gave her her permanent nickname, le Castor—the Beaver.) But she fell in love with Sartre, once she got over the physical impression he made. Sartre was about five feet tall, and he had lost almost all the sight in his right eye when he was three; he dressed in oversized clothes, with no sense of fashion; his skin and teeth suggested an indifference to hygiene. He had the kind of aggressive male ugliness that can be charismatic, and he wisely refrained from disguising it. He simply ignored his body. He was also smart, generous, agreeable, ambitious, ardent, and very funny. He liked to drink and talk all night, and so did she.
more from Louis Menand at the New Yorker here.