By Sandra Rose  | 

Stock photo: Getty Images

This post explores the effects of "Dopamine" on the human brain when two people are initially intensely attracted to each other. It's easy for 2 people to believe they are "in love" during this initial exciting phase. Unfortunately, the excitement phase doesn't last.

Dopamine is one of three main neurotransmitters (chemicals) in the brain that creates "chemistry" between 2 people in the initial excitement phase. The other two chemicals are adrenaline and serotonin. Dopamine, adrenaline and serotonin triggers an intense rush of pleasure that should result in the procreation of children.

The reason it is so difficult to maintain a stable relationship in the longterm is the basic evolutionary drive to ensure the survival of the human race.

This basic evolutionary drive is much more intense in men. A woman can only get pregnant once a year (twice if she times it right). But men can sow their seeds literally hundreds or thousands of times per year. Which can lead to problems with infidelity.

Stock photo: Getty Images

The dopamine phase eventually fades after 2 weeks, 2 months or 2 years.

So what can you do to sustain that intense pleasure in your relationship for a lifetime? First, make sure you are both equally yoked.

Psychologist Daniel Sher says the initial excitement phase is "replaced by a feeling of safety and predictability, which can be a death knell in relationships."

He suggests breaking the cycle of monotony by doing something different. Start by remembering that you are both distinct individuals with different needs; What do you want? What do you crave? What gets you going outside of sex? Outside hobbies that break the routine, whether done separately or together, can bring your sex drive back to life.

"If the relationship is stagnant, often the individuals also feel stuck in their life," Megan Lamber told Elite Daily. "Ask yourself, 'What do I really want? What is a secret dream of mine I could explore?' Then go out and try it."

"Couples get boring because they assume they know each other already," explained Lambert. "They don't. In every moment, your partner is a new and unique human. Imagine you are an alien meeting your partner for the first time. What would an alien be curious about? What would you want to know? Explore each other as if you were two aliens, totally new, totally fresh."