How do you masterbate? If you do it in a fashion that does not replicate sex (I read of one man who did it by rapping his knuckles on his penis, and as a result could not get off during sex) your body could become accustom to cumming this way. If that happens it can hamper you during intercourse.
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"I aint got time for pain! The only pain I got time for is the pain I put on fools who don't know what time it is!" - Terrible Terry Tate
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