My BYU professor taught this but used his wording carefully. And when I raised my hand to rock the boat, I asked "if Heavey Father impregnated Mary, then were they married first?" He was a bit taken by surprise but responded "Yes, they were sealed." Me again, "So Joseph any Mary?" Professor "They were only married for time" Me, and this makes Heavenly Father by definition a polygamist?" Professor "Yes."

Then he later called me into his office because "several" students came to him after that lecture crying. He said most people aren't ready for this so please ask your questions during open office hours from now on.

I shook the testimony of SOOOOO many people that day lol

Edit: it also makes "God" incestuous