This is some scary stuff.
80 percent of people could be carrying some STD like HERPES and whatnot... and may not even know they have this stuff going on!
That's why I say this... get the test done. You should. Especially if you're gettin' down with someone who you know has been getting down with other people recently or while you were together or whatnot.
You just don't know. So, go to the doc and get that stuff tested and checked out. Because you need to know...