Men of reddit: Is this normal?

Usually me & my SO have sex every other day or so but for the past week we've been going at it daily. Sometimes even two or three times a day. Today he mentioned that when he cums he doesn't get that relaxation feeling, he claims he still enjoys it and all but the actual "finishing" just doesn't feel the way it did before. To top it off he usually has a "bigger load" than what he's been giving this week. He went as far as to say I'm draining him. So my question is, is this normal?

He's 27 and I'm 19 if it makes a difference at all.

EDIT me & my last ex boyfriend would constantly have sex and he never had this issue and he was 26, that's why I was wondering if this was common amongst men.