Not only women experience a decline in their sex drive midlife, but also men. Many men also notice a decline in their libido after they reach the age of 30. One of the main reasons for a decrease in male sex drive is a drop in testosterone levels. It is possible to increase libido and testosterone in men without having to resort to hormone replacement therapy. Here are some easy ways to increase testosterone and male sex drive naturally. Celery is a great food that increases testosterone. It is so potent that it can cause testosterone to be produced in your testes by simply smelling it. It is found in…