But staying in love isn't always so exciting... at least, according to common knowledge.
However, long-term lovers are in luck! A 2009 study released by Stony Brook University suggests that passion isn't a limited resource. Scientists at the university scanned the brains of couples who had been together for 20 years and compared the findings to the brain activity of newfound lovers.
The long-term lovers had similar MRI activity in the regions of the brain that new lovers had. Previously, it was thought that this stimulation might dwindle, or even cease entirely, once lovers had been together for a while. Fortunately, we were wrong long-term passion and excitement is possible, both emotionally and chemically speaking.