couple-walking7%: The amount a man reduces his speed when he’s walking with his wife or girlfriend as opposed to a platonic female friend, according to an October 2013 study published in the journal PLOS One.

The reason sounds downright Darwinian: When a woman moves at a quicker-than-comfortable clip, it can disrupt her reproductive system (no kidding). So a man slows down to match his partner’s pace in an unconscious move to reproduce.

Hey, you want to have kids; he wants to take it slow. It might work out for both of you.

~ Real Simple magazine, February 2014 issue