Yawns are more contagious among people with closer relationships.
163
Intelligent men tend to be more sexually faithful.
31
Women rate men more attractive if other women are looking and smiling at him.
17
One in five long-term love relationships began with one or both partners being involved with others.
177
Wearing red increases attraction.
30
Historically, sweat has been an active ingredient in perfume and love potions.
309