One in five long-term love relationships began with one or both partners being involved with others.
177
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Intelligent men tend to be more sexually faithful.
31
Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
69
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
Men fall in love faster than women do.
32