Why does my fiance not want to have as much or more than me?

Seriously though, hes 30, im 21. I am a very attractive girl, with a big chest and will do almost anything for him. I have a wardrobe of different outfits to wear for him in the bedroom but his drive isnt as high as mine. I will give whatever he wants to him, in ANY way but hes just always too 'tired'. He is only doing 3/4 days at work and just sits on his backside when he gets home. Any ideas guys?