10 Things You Don't Know About Kissing

Do you know where XOXO came from? Or why you get so turned on from a kiss?

There are tons of nerve endings......in your lips (100 times more than in your fingertips!) that stimulate desire. That's why smooching before, during, and after sex can be extremely arousing and satisfying.

2. Forty percent of men say that......a really long, steamy kiss will get them immediately. (Thirty percent said that it will do it. Duh.)

3. Pay attention to those "See ya later" pecks. If your guy......routinely only gives you a quick kiss on the cheek when saying good-bye, it could be that he's guarded and doesn't emote easily. If this is a more recent development, it's a warning sign; he may be feeling ambivalent about the relationship.

4. Instantly turn up the kissing intimacy by......closing the "A-frame": a smooching stance in which you and your guy are in the middle of a smooch but your hips are a mile apart. By pressing your hips together, the degree of desire quickly rises.

5. The best way to kiss a guy's ear? Kiss and......suck on his earlobe for a moment and then trace the outline of his ear with the tip of your tongue. (Bonus points if you whisper something naughty to him.)

6. Men initiate open-mouth kissing to transfer......libido-boosting testosterone to their partner. So when he's getting a little more aggressive, it's not just about his desire - he wants you to be a bit more amorous too.

7. Men are more than twice as likely......to have sex with a bad kisser than are women.

8. When coy kisses aren't going to cut it......here's why you should let loose: Passionate kisses elevate your blood pressure and cause your heart to beat faster, getting you more excited, and making it easier for you to reach orgasm.

9. Fifty-four percent of women......between the ages of 18 and 24 say they've kissed another girl. That number drops to 43 percent for those between 25 and 34.

10. During the Middle Ages, people signed legal contracts......by making an "X" on the document and then kissing it to pledge their honor. That's how XX became shorthand for a smooch.