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Also if you fuck a girl like Aqua or Shion for example they won't know whether what you're doing is good or not, they'll just think you're amazing cause you made them pass out after a few mins of sex.
But if you try and tackle one of the sex hags like Koyori, Aki etc. they'll call you pitiful for asking for a short pause to recoup after your third time cumming and loudly wonder if you're really up to the task.
So yeah, you don't want that.