Yes, I subscribe to the saying that too much of a good thing is bad.
However, you are young and as long as your bodies can do it, why not? You may experience some scrotal pain form the trauma of the balls banging around, but when you are older, you will look back at this time with great fondness.
Be sure to use plenty of lube, though. She can get quite sore, otherwise.
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is there such thing as too much? 
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