Why is it always me?

For the past three months I have been trying to get pregnant. My partner puts his foot down about being on top, everything thing I have read says, and shows better results with the man on top. I think I have talked him into going on top once since we have been trying to get pregnant. He says it's not because of back issues, or his knees, not even religious beliefs, He just tells me I do it better a kinda why fix what isn't broken thing. When I tell him we will have a higher chance of getting pregnant he said that's baloney it's all going in the same place. Should I stop fighting dose it even matter how it's served?