The penis sex pump is a tried and tested sex aid for the temporary enlargement of the penis. It works by creating a vacuum in the cylinder causing extra blood to rush into the penis. You will notice immediate effects, not just in the size, but also in the hardness of your penis when you remove it from the cylinder. For use on all cock sizes, Ben's Bigger Dick Kit features a revolutionary pressure escape valve so that you don't over suck as too much pressure can damage your blood cells.