He’s over-sexed. I’m under-sexed.

I’m 38. My husband is 42. Sex, when we have it, is great. But he is overly sexed. If I were willing, he would mount me 24/7. Meanwhile, I’m under-sexed. I don’t have much sex drive, nothing like his. I’m rarely in the mood, which makes me guilty and drives him crazy. Is there anything I can take to heighten my libido? HELP PLEASE.