TTC with low sex drive hubby

Hubby and I just started TTC this month. He has a very busy work schedule and a surprisingly low sex drive. I see that everyone is having sex 3-5X a week while they're ovulating, and I can't even remember the last time hubs and I had sex more than once in a week. Obviously, it needs to happen more often if we want any kind of chance of making a baby. What can we do to up his drive? Or what can I do to get him more interested?