We all make mistakes. And some mistakes need to be made once, to get it out of the way. So you can begin the rest of your life. For example, living with a couple. Most people will tell you, "Well duh, of course that's a bad idea." But it begins so innocently, with so much temptation.
"We have an extra room and the rent is way cheap!" You walk in and what the -- this place is way nicer than yours! They have all these appliances you don't have! These Williams-Sonoma cereal bowls they got as a wedding gift fit perfectly in your hands!