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Men and woman have been kissing forever, right? Actually it's a relatively new behavior for humans. Social scientists have no idea why we make out, except that it feels awesome and stops her from asking you "what are you thinking?" Here's some other surprising trivia about smooching...
1. The Wedding Kiss Originated In Ancient Rome
Kisses were used to finalize contracts. The practice continues today every time you kiss your boss's ass.
2. The Term "French kiss" Started As A Slur
In the 1920s, the British poked fun at the decadent French custom of swirling tongues.
3. Public Kissing Is A Crime In Indonesia
Punishable by five years in prison. Not the worst way to stop PDA.
For more on kissing, watch "Guy Code" Tuesday at 11p/1oc on MTV2
4. Women In Victorian Times Kept Pins In Their Mouths
To avoid unwanted kisses in the dark. Maybe this is where tongue piercing got started?
5. The Guinness World Record For Longest Kiss: 50+ Hours
It still wasn't enough foreplay for the woman.
6. Actress Lana Turner Raised $5 million In War Bonds By Selling Kisses
For $50,000 each. (Kate Upton, if you're reading this, your nation needs your help.)
7. Serial Killer John Wayne Gacy's Last Words: "Kiss My Ass"
Not a nice guy.
8. England's King Henry VI Banned Kissing
And yet, somehow, cricket remained legal.
9. A Man In China Ruptured His Girlfriend's Eardrum With A Kiss
An "excessively passionate kiss." Keep searching for that clitoris, buddy.
10. In The 1930s, Hollywood Actors Had To Kiss Sitting Or Standing
Because people did not ever lay in beds in the 1930s.
11. Kissing In The Trobriand Islands Involves Biting Off Eyelashes
Still not as painful as getting a Brazilian wax.
12. Only One Muscle Is Used For Kissing
13. Kissing Burns Two Calories Per Minute
So technically, making out counts as cardio.
14. Women Used To Send "Telegraph Kisses," Lipstick On Paper
We prefer it when our girlfriends send boob photos to our phones.
15. Kissing Might Serve An Evolutionary Purpose
Endocrinologists believe that kissing might allow women to sample a potential partner's genome to determine if he's a suitable mate. (Yes, kissing on the mouth, we mean.)