I fully understand what you're saying, Perna. Through my own experience, sex is pleasureable from beginning to end. However, my catharis, the begining and up to the end, hasn't been pleasurable. Maybe catharsis is different for other people, IDK.
If you'll forgive my crudeness, I equate catharsis with an enema.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.