Sex drive

So I just turned 20 and my boyfriend is 27.

I love him dearly. But he gets so tired after having sex. We do it once and he's done. Whereas I can go up to 3 times in the course of an afternoon.

I feel bad but I don't know what to do. There was one time we did it twice and he was dead. He was snoring a minute later and slept through the night.

Any advice?