File this under strange but true. A kiss may be a kiss, but the way you approach your partner as your lips grow closer to his cheek or mouth depends on one BIG factor. And age has something to do with it.
Ready? It depends on WHO is on the receiving end of your love. If you're kissing your child, your head will tilt to the left. That holds true for moms AND dads, and it doesn't matter if the parent is kissing a son or daughter. But if you're kissing your significant other, your head will tilt to the right.
Really! At least this is the conclusion that researchers drew after studying photos of different pairs--parents and kids, and husbands and wives. The reason we lean leftward when kissing our kids? We tend to cradle our babies in our left arms from the get-go, so our lips and heads naturally go there, even as they grow older.
So when you're bestowing kisses to family members and your S.O. (or friends) later, notice which way your head goes!
via Science Daily