It's a matter of trust, first and foremost. IMHO, at 16 you can't really know or trust a person. My sister also started her sex life at 16 and had a stable friend. She never used protection, because it was serious.
Guess what, the guy was a carrier of several STD's and my sister took years to heal, because that bastard never cared to take proper medicamentation. she had one mean bacteria and given that she couldn't shake it for over 2 years, there are chances she might be infertile.
My point is: protection is good if you plan to have a one night stand. If you're planning to go steady, have a serious relationship and not use protection, GET TESTED BEFORE HITTING THE SACK !!!!! And of course, wait for the results.
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