Here's one that's not on there: Steering Wheel Couple.
When we learned to drive, the instructors to keep our hands (like on a clock) one on the 10 and one on the 2. Most often the wife is the 10 and the guy a 2. Could be in their appearance, energy, or personality. One of them either isn't into swinging, is too lazy to make the effort, or had a tough battle with nature. This having been written, your perception about a couple is like your reaction to art; completely subjective. You are "into" what you are "into" ;-)

