Bathmate Max Out Jelq Penis Enlargement Serum 100ml Introducing the Bathmate Max Out Jelq Penis Enlargement Serum in a generous 100ml bottle! If you're looking for "natural penis enlargement," we've got just the thing. Jelqing is a therapy technique that stimulates blood pressure, circulation, and cytokinesis to achieve those desired gains. It involves a unique squeezing motion, stroking the penis from the base to the corona of the glans. But before you dive into jelqing, let's set the stage. After using one of our Bathmate pumps in the bath or shower, allow your erection level to drop to 50-75 percent. You want your penis to be relaxed enough for easy blood flow. Remember, never perform jelqing exercises with a full erection.