Conflict between Horus and Set

By the Nineteenth dynasty, the previous brief enmity between Set and Horus, in which Horus had ripped off one of Set's testicles, was revitalised as a separate tale. According to Papyrus Chester-Beatty I, Set was considered to have been homosexual and is depicted as trying to prove his dominance by seducing Horus and then having intercourse with him. However, Horus places his hand between his thighs and catches Set's semen, then subsequently throws it in the river, so that he may not be said to have been inseminated by Set. Horus then deliberately spreads his own semen on some lettuce, which was Set's favorite food (the Egyptians thought that lettuce was phallic). After Set has eaten the lettuce, they go to the deities to try to settle the argument over the rule of Egypt. The deities first listen to Set's claim of dominance over Horus, and call his semen forth, but it answers from the river, invalidating his claim. Then, the deities listen to Horus' claim of having dominated Set, and call his semen forth, and it answers from inside Set.[6] In consequence, Horus is declared the ruler of Egypt.

http://en.wikipedia.org/wiki/Horus