first kisses

so my wife and I were watching this gum commercial that said the average person has 28 first kisses.  28?  that sure seemed like a lot to us.  of course i guess we're a bit of an anomaly since we've known each other since junior high.  i only got to like 18 - my wife thankfully was less at 12.  i assume i'm one of them.  but think about it - 28 - that's a lot of lips and spit.  in today's society that a reasonable amount of something else as well?  the human mouth has 600 different species of  bacteria with 100 million per mililiter of spit - yikes!  and then you're swapping with 28 others - i'm not really a super germ-a-phobe despite being a microbiology major, but that kinda makes you reconsider kissing strangers (i've honestly been trying to cut back, especially the beards).  how many have you swapped with in your lifetime?