stress and how tired we are after work really does play a factor, but we try to at least 3-5 times a week. sometimes alot more and sometimes less. my sex drive goes up and down. if i am not really in the mood i will usually give him a bj so he gets off and everyone is still happy.
With my ex-wife we would do it 7-10 times a week, we didn't even slow down when she was pregnant. I have a crazy high drive and she is the first women I met whos drive was almost as high as mine.