The classical allusions and the Platonic disquisitions on beauty are no longer a form of cover, but integral to Aschenbach's complex sexuality. Moreover, the wandering around Venice in pursuit of Tadzio isn't a prelude to some sexual contact for which Aschenbach is yearning.
Mann's sexuality and his attitudes towards it are extremely complex - and the complexities are inherited in the figure of Aschenbach. Mann had lived through a series of (almost certainly unconsummated) relationships with young men.
