Do you ever get tired of having sex?

My boyfriend and I hooked up recently and had already fucked earlier that night. When I sucked him off and he finished he said it made dick hurt? We’ve gone up to 5 rounds in a night so i was surprised to hear this after the second round and I feel like lately we have only been hooking up once or twice every couple of days now. Can there be such a thing as too much sex for a guy and does it make you no longer feel attracted to your girlfriend?