Yes, you will feel tired (an effect not originally discussed). Sexual activity is physical activity, whether done alone or with another. It is an expenditure of energy. But like any other expenditure of energy, your body simply regroups, and whether you begin this activity at 5, 15, or 50, makes no difference.
I would recommend a course on basic anatomy and human physiology. Not taught by a cleric.
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Mean what you say, say what you mean -
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