"Sex is a covenant between a man and a woman and God."
-- Christine O'Donnell
Wouldn't a threesome with God be a little, I don't know, intimidating? I mean, there you are with your insignificant man-parts while God's pulling a Dr. Manhattan on her, making her come from halfway across the room -- all while she's calling out his name over and over.
Plus, I have to imagine that God semen is powerful stuff. Probably burns right through you like Alien blood. You'd have to make sure you're out of the line of fire.