What are some unusual features or quirks that people have been unexpectedly drawn to in others?

How has our constant access to biometric data changed the way we feel about being healthy?
What's the best part about having more free time in your 70s, and how do you choose to spend it?
How dirty is the water in airplane lavatories, and should passengers avoid using it?
Does your family expect you to follow traditional rules when it comes to who you date?