We think it's a sign of great sex when you start to say things that don't really make sense, but feel totally right in the moment. Like, "Oh, fuck me so badly!" We mean, she doesn't want the sex to be poor quality, obviously.
They're both wrapped up in each other, and their mumbling gets to the point where no one is listening (including us) to what's actually being said. This is great news! You've passed the point of coherence, and into orgasm-land!
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