Couples' personalities converge over time to make partners more and more similar.
235
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
40% of people who are rejected in romantic love slip into clinical depression.
72
When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130
According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
14
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
A man's beard grows fastest when he anticipates sex.
239
One in five long-term love relationships began with one or both partners being involved with others.
177