Even the happiest of couples can go in for dry spells or worst stop having sex. Experts say that early stage of intense and romantic love increases the dopamine system which then increases testosterone and strong libido. And while the attachment becomes more and more powerful sex drive lessens. When a couple first meets and falls in love they can t get enough of each other and enjoy lots of sex but with time it turns into minimal amounts. Here's why... Stress: This is one of the most-used excuses and be it work or family it hits your sex life.