The pioneering work of Johann Winckelmann (1717-1768) identified a homoerotic appreciation of male beauty in classical Greek sculpture, a fascination that had endured in Western art since the Greeks. Yet after Winckelmann, the value (even the possibility) of art's queer beauty was often denied. Several theorists, notably the philosopher Immanuel Kant, broke sexual attraction and aesthetic appreciation into separate or dueling domains. In turn,...