Hubby not into doing the baby dance enough to get pregnant

My husband and I are TTC but he thinks he knows everything. He has 6 sisters, 5 of which have kids and he says that we don't have to have sex everyday during ovulation get pregnant. He says things like "do you think so-and-so had time to have sex everyday to get pregnant? " or "it only takes once". I know it can only take one time to get pregnant but I feel that if we are TRYING to get pregnant then the more frequent the sex the higher the chances.... any advice on getting him to BD with me more often?!