Alexander's sexuality has been the subject of speculation and controversy in modern times. The Roman era writer Athenaeus says, based on the scholar Dicaearchus, who was Alexander's contemporary, that the king "was quite excessively keen on boys", and that Alexander kissed the eunuch Bagoas in public. This episode is also told by Plutarch, probably based on the same source. None of Alexander's contemporaries, however, are known to have explicitly described Alexander's relationship with Hephaestion as sexual, though the pair was often compared to Achilles and Patroclus, whom classical Greek culture painted as a couple. Aelian writes of Alexander's visit to Troy where "Alexander garlanded the tomb of Achilles, and Hephaestion that of Patroclus, the latter hinting that he was a beloved of Alexander, in just the same way as Patroclus was of Achilles." Some modern historians (e.g., Robin Lane Fox) believe not only that Alexander's youthful relationship with Hephaestion was sexual, but that their sexual contacts may have continued into adulthood, which went against the social norms of at least some Greek cities, such as Athens, though some modern researchers have tentatively proposed that Macedonia (or at least the Macedonian court) may have been more tolerant of homosexuality between adults.