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Watery sperm is generally not suggestive of any disease, it is quite possibly related to excessive masturbation in itself.
Pleasure during masturbation is again not a sign of medical disease, but more likely due to anxiety or stress.
Kidney stones are not likely related to either problem in your situation.
I would recommend a medical examination and semen examination as needed for the same, though I do not think there is any immediate cause of worry,
Dr Gupta, MD