Is it just me but...

I want to have sex all the time. My bf works 6 days a week so I know he is tired a lot. We have sex just not as much as I would want. If I start it we will do it but than I feel some type of way because I know he is tired. If we had it my way we would have sex at least 6 times a week. So I pleasure myself a lot. I just love sex with him! How can I get him to want it as much as I do. By the way, we have great sex and he always says how good it is.