I agree with Rob... and too that I would add that if the frequency isn't enough for you, then you really need to think about where the relationship is headed. I know it might seem doggish, but I don't think it is. Think about how you would feel in a few years if it slacks off to only once a month, once every other month... or less. As kids, careers, and other things take up more and more time, it's easy for sex to become even less of a priority. Plus, as they age, many women's libidos usually diminish.
Sex / intimacy is something that's really important in a long-term relationship / marriage, and if one person isn't fulfilled it usually becomes a constant source of pain, friction, and guilt. Can you guys communicate, get on the same page, and make sure both of your needs are met?