Is there such a thing?

Is there such a thing as too much sex? I only see my boyfriend on the weekends due to distance, and when we're together we can't seem to keep our hands off each other. We can have sex up to four times in a weekend. But is there a ever a point where it's just too much? It's not all our relationship is, we get out and do things but, sometimes it feels like that's all we do? Plus, protection is always used.