Wearing red increases attraction.
30
Intelligent men tend to be more sexually faithful.
31
A man is more likely to get a woman's phone number if he is accompanied by a dog.
20
Yawns are more contagious among people with closer relationships.
163
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165