Women rate men more attractive if other women are looking and smiling at him.
17
Intelligent men tend to be more sexually faithful.
31
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
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
Raj from the Big Bang Theory is married to Miss India.
11