I don't think having sex is as important as being physically and emotionally intimate. For example, as soon as my boyfriend comes home from work we cuddle/make out for about an hour or so. We do this everyday and it's not because we feel we should but because it comes natural. We just automatically jump in bed when we get home!
The main reason why we don't have sex everyday is because he's uncomfortable with his body and isn't in the best physical shape so he can't perform as well as he'd like so he gets down on himself. . .which is such a turn-off for him of course. I constantly assure him he's sexy to me (which he is) and I'm always initiating the sex but I guess what he thinks of himself is what is going to make the difference here. Anyway, that's my take on it.