Obviously you are not yet totally fit and this is the reason for your legs and feet getting weak. During sexual intercourse you know that the muscles become tense there is a rise of heart beats and breathing which at the completion (orgasm) return back to their usual state this is why you feel a sense of lethargy after, which may last for hours as does in your case. Please speak to your physician about it. Since you are a tennis enthusiasist please continue, ensure you take a healthy diet and I am sure you will get over this problem.

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