Scientists studied 48 married couples in Bangladesh to learn more about patterns in kissing.
The people of Bangladesh are ideal for studying this issue, as they are prohibited from watching kissing scenes on TV or in movies, so they are protected from exposure to external factors.
Two-thirds of the couples studied turned their heads to the right when kissing, regardless of whether they initiated intimacy or not.
Men were 15 times more likely to initiate kisses and saw their partners tilt their heads to the right.
Researchers believe that this direction of tilt is determined by the dominant hand. Right-handed people are more common in the world, so people tilt their heads to the right more often.