SPOILER!!! . . . . . . . . . . . . . . . . . . Seth tries to rape Horus but Horus rapes Seth instead. Seth then gets flashbacks of how Horus' dad raped Seth and Seth had to accept the rape so Horus' dad would give Seth's son (ANUBIS) the cure to Anubis' disease.
https://en.m.wikipedia.org/wiki/Homosexuality_in_ancient_Egypt