Yawns are more contagious among people with closer relationships.
163
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
278
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103
Intelligent men tend to be more sexually faithful.
31
Men fall in love faster than women do.
32