I've got to agree with Huntersgirl. If it gets TOO rough then the heat of the moment will go. Trust me it happened to me.

Seconds from the big O she thought she would draw blood from my back. My cock went instantly limp - never saw her again. It was embarrassing because I had to explain the scratch marks to my girl friend - that went down a bomb

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enjoy while you can - if it feels good it is good.