Different interests

Honestly, I think a couple has to have at least some common interests with each other. It's nice to have some variety in a relationship, but if most of your interests are polar opposites, not much good can come from it. For starters, both of you will be doing what you love away from each other, and not spend as much time enjoying things with each other, because you both know the other isn't very interested. Secondly, one or both of you may end up compromising their own interests, or pretending to enjoy activities that they really don't. Having some common ground when it comes to hobbies and interests I feel is important for a solid relationship.

Jam it back in, in the dark.