The semen is secreted through the urethral opening at the end of the penis, the sperm then race towards the egg through the fallopian tubes. There are many natural penis enlargement products that can help men achieve a bigger, harder erection for a very satisfying sex life. Penis Stretchers are a recommended penis enlargement method as they have been both clinically proven to work and are also medically backed. This meaning that you are both guaranteed to see size gains and that you will not see any side effects. Think of the advantages and also disadvantages of these treatments.