My boyfriend's sex drive

Hi everybody, 
im in need of advice. My boyfriend and I have been together for over 3 years and we are very in love and happy with our relationship. however, in the past 6 months-year, i have noticed that our sex drives have taken very different courses. We don't get much alone time since we both just graduated college and still live at home. when we actually are alone, i always wanna "get busy" right away while he would rather just talk or hang out. and dont get me wrong, i love just hanging out with him but it seems like if i never initiate sex or any kind of physical touching, we wouldn't have it at all. we have talked about this before and he can't really come up with an explanation for his lack of drive and he knows that it makes me feel undesired but it really hasnt gotten better.
thoughts or advice?