How to relieve stress using sex is the most effective way to bring back the spark to your relationship. Energy and Stamina Birth Control Patch works on the foundation of hormones. Basically it has two female hormones estrogen and progesterone, which prevents ovulation. It does not permit the eggs to developing from your ovaries. So, if there is no egg, what sperm will fertilize, knowning that prevents pregnancy. It also thickens the cervical mucus in order that the sperm cannot achieve the eggs.