See in particular, Marvin Meyer, “The Youth in the ‘Secret Gospel of Mark’” Semeia 49 (1990), pp. 129–153; and Raymond E. Brown, “The Arrest of Jesus, Part Three: Naked Flight of a Young Man,” The Death of the Messiah, vol. 1 (New York: Doubleday, 1994), pp. 294–297. Morton Smith developed a hypothesis, based on the “Secret Gospel,” that Jesus’ nocturnal baptism of Lazarus was an initiation into an esoteric mystery cult that may have included some kind of “physical” (sexual) union: The Secret Gospel, pp. 89–114. A short discussion with many of these citations is given by C. Clifton Black, Mark: Images of an Apostolic Interpreter (Columbia: Univ. of South Carolina Press, 1994), pp. 139–140 and notes.