'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
255
Wearing red increases attraction.
30
In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
456
The left ear is more responsive to words of love and emotion whispered into it than the right.
44
Historically, sweat has been an active ingredient in perfume and love potions.
309
One in five long-term love relationships began with one or both partners being involved with others.
177
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
When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130