Why Did the Pharaoh Masturbate Into the River?

And why it never comes up in the History books

Ancient Egyptian temple by the river sourced from Wikimedia Commons.

The Nile shaped the world view of ancient Egyptians. It was a river that blessed its people with a source of food, water, and transportation. Egyptians were dependent on it as a source of moisture and nutrients for crops since rainfall was almost non-existent in the area.