Although it has been suggested that vacuum pumping the penis may result in slight gains in penile size if used constantly over many years, the fact is that this has not been proven with clinical tests. Also, having to use a mechanical device on the penis for several years is obviously less than satisfactory. These pumping devices are therefore considered fine for temporary gains in erection size. On the other hand, penis traction has been proven in clinical tests to achieve permanent enlargement in length and girth of both the flaccid and the erect penis.