It's anything that makes us both say, "wow" afterwards. I can get a serious workout in a 15-minute session and I've also gone the better part of an entire weekend (stopping for occasional food and sleep) and they are both great.
There are specific things that make it "great" for me, but I don't think enumerating them does the question any good. If you're both enjoying it, it's great sex.
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"take me down, little *Susie*, take me down
I know you think you're the Queen of The Underground"
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