By long term I mean 5-10 years.
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Yeah, people become familiar and used to each other. You have to make an effort to keep it energized. That was one of my mistakes in my past relations. I've been avoiding repeating it in my current one.
It helps, and I by no means suggest you are doing it, if both partners don't let themselves go after they get in the relationship. By maintain your appearances as close to as when you first met, goes a long way to keep the passion.