A lesser-known Dutch master with a penchant for male backsides created some of the greatest homoerotic paintings of all time.A lesser-known Dutch master with a penchant for male backsides created some of the greatest homoerotic paintings of all time.Read MoreArt, Cornelis Cornelisz von Haarlem, Homosexuality and Bisexuality, Sex, Men and Boys, Rijksmuseum, National Gallery of Denmark