I hope the OP is okay. I would have a long chat with your OH about how you are so concerned about him looking down there, that it is making you anxious and not want him to be there. I am sure if you explained it, then he would see just what a massive deal this is to you and not disrespect your wishes.
My husband is not good with blood and stuff, so we thought there was no way he would look. But he did and I was watching him as I birthed our baby, all tearful with a lump in his throat, that moment felt like it was just us three of us in the entire world
He was even a bit disappointed that he couldnt watch number four come out of the section cut
We kept the magic, he doesnt relate what he saw those times with sex or anything. They are just special memories.