As relationships progress, the time you spend smooching diminishes. Where kissing was once an enjoyable entree unto itself, it becomes a mere appetizer couples hasten through on the way to the main course.

One study found that people who smile in childhood photographs are less likely to get a divorce.

Scientific studies about relationships fascinate me, and I devour them hungrily, especially when they give big, fancy-sounding names to everyday experiences.

Women tell stories; men want answers. Guys get impatient when we drone on forever; we get frustrated when they tune out.

Subsisting on a diet drawn from one food group isn't healthy or gratifying. Even eating cupcakes 24/7 eventually would get old!

Divorce is contagious. That's right - when you have a close couple friend split up, it increases your chances of getting a divorce by 75 percent.

If you had asked me when I was 28 and in my wedding dress if I ever thought I would end up in my forties flipping my husband the bird over potato chips, I'd say you were crazy.