(NSFW)!! Can't get enough?

Yes I know with all the other more important things going on in the world, sex is probably at the bottom of the list for most of you but I need some advice. Since I hit the big 4–0, my sex drive is in overdrive. I don’t know if it’s the food I’m eating or what but I want it more but I’m getting it less and less. Hubby works at night and then when he’s not at work he is exhausted (or acts like he is). He says it doesn’t matter if he’s tired just tell him when I want it and go for it but it’s not that easy. When I do jump on him he seems out of it, bored and lethargic. YES, I know he’s tired! He has no real energy for sex so I end up doing most of the work and then he passes out. Sometimes I actually hear him let out a loud sigh as if he’s just passing the time. When he does initiate sex it’s the same old moves and positions and I’m so bored it’s like watching paint dry. Don’t get me wrong, he’s a great lover when he’s not tired. Lately I just haven’t been getting any. I don’t want to hurt his feelings or bruise his ego by complaining about it and I know he’s trying but what’s a girl to do for pete’s sake?!?!He took a week off from work last week and the first thing that came to my head was “great a whole week of sex!” During that entire week we did it ONCE.
What do I want? How can you help? Tell me how to make him want it more and initiate sex without me hurting his feelings. How do I bring out the freak in him? If I don’t tell him I want it or if I don’t climb on him he won’t touch me for weeks! WTF is happening here? I do everything and anything to turn him on and I never say no to anything so it’s not that I’m some boring prude.