40% of people who are rejected in romantic love slip into clinical depression.
72
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
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Men fall in love faster than women do.
32
Yawns are more contagious among people with closer relationships.
163