Marvin Gaye gave the world a lantern with 1971’s “What’s Goin’ On,” but for the remainder of his short life he struggled with the pressures of stardom and the dark demon of uncertainty. After a bitter break from Motown, he sought sanctuary in a gloomy Belgian port. Grappling with the duality of love and lust, the divided soul turned pain and passion into his first Grammy-winning album. With every whispered word, every sultry note and each burst of sweat-dipped funk, “Sexual Healing” laid bare the tormented genius of an artist in exile.