Yeah, Egyptian mythology is pretty messed up, and very obsessed with jizz. In at least one version of the creation myth (there's a few, that's what happens when your religion hits 3000 years) Ra masturbates the world into existence.
And Set definitely gets a bad rap, but unlike most examples that started in the original culture. His role was redefined following a war between cults and the Hittite (IIRC) invasion, which was blamed on Set since, as the god of war and foreigners, that's the sort of thing you'd expect him to step in on.