One in five long-term love relationships began with one or both partners being involved with others.
177
Couples' personalities converge over time to make partners more and more similar.
235
You burn 26 calories in a one minute kiss.
605
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44
Wearing red increases attraction.
30
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14