2. There’s No Sex Life
A good sex life means different things to different people. Some people think a few times a week is perfectly healthy, while some maniacs want to get some nooky every day. The point, though, is that you’re having sex regularly and you’re mutually enjoying yourselves. If there’s no fire in the bed (or on the couch, or in the shower), then you can bet the rest of the relationship will eventually fall apart, too.