In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
16
Wearing red increases attraction.
30
Yawns are more contagious among people with closer relationships.
163
Historically, sweat has been an active ingredient in perfume and love potions.
309
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Women rate men more attractive if other women are looking and smiling at him.
17