Now, that's just silly.
God wouldn't have waited until someone chose to accept his Son into her womb.
He knew who He would choose well before Mary had an inkling of what was going on. The angel told her what God was going to do and she believed the miracle would occur.
That's not "rape".
I'm not trying to be silly or obtuse. I am trying to discuss the implications of predestination as opposed to foreknowledge. Mary was not a victim or a divine broodmare. She was preserved sinless because God knew she would cooperate perfectly with Grace.
Peace be to you.