I won't be able to give you a definitive answer to that because it's only been around 4 months since I started pumping with the Bathmate and from what I have read around the forum it takes longer than 6 months to get permanent gains. However, the last time I had sex with a rubberband ULI at the base the base girth was so much thicker, much thicker than my post pump ULI pre-sex routine usual, even though the gain was temporary at the moment.