frustrated

I am trying to be understanding, but my so is so upset because we are not having sex enough in his eyes. granted its 1 time maybe 2 times a week, but still. I cant seem to make him understand that I just have no desire, even when we do. he gets all pouty and says he must just be bad at sex cause I dont want to. I'm so over trying to explain that I'm just not in the mood all the time. grrrr...