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Sounds like a broken blood vain in the area where it hurts the most.
broken blood vains can be temp or for a long time, they can come and go without you knowing it.
Also STD tests are not really accurate when you keep in mind that some problems not appear right away, but after 5-7 months.
Anyway, to much fucking causes muscle contractions in areas where you never felt it before also. This causes people to worry, cause they experience a first time pain.
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