>>938371933
It was institutionalized as a kind of aristocratic big brother system where the 'big brother' didn't just teach the 'younger brother' how to act properly or point out who to talk to when he had problems or help train with him for war, but also fucked the younger man.
This is pretty well established. It was part of a mentorship tradition in Greek society. One that even the Romans (who didn't hate gays like Abrahamic religion followers did/do, but considered them weird), thought was fucked up.