A more extreme example: childbirth is a notoriously painful process, often depicted in modern media as filled with screams and groans and facilitated by numbing drugs. And yet there's something called the Orgasmic Birth movement, which consists of women who train themselves to experience the intense sensations of child birth as pleasure, and many women are indeed able to experience their births as an orgasm instead of a horrible painful ordeal. That's not to say that it's easy to train oneself to experience the very intense sensations of childbirth as pleasurable, but just that it's possible.
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