| A LOT of STDs can lie dormant in your system, and quite a few can trick you into thinking you're perfectly healthy.  Best to be tested regularly--even if you stick with the same sex partner.  When it comes to this, it's better to err on the side of caution--the majority of STDs can be treated effectively if caught early, but if not they can cause permanent damage to your reproductive organs.  Be safe! 
				__________________If I am not better, at least I am different. --Jean-Jacques Rousseau
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