Level of your erection

When you do jelking, you need to take into account the level of your erection. You don't have to do jelking to make a member of the naboo completely (upgraded) - that might be unsafe. On the other hand, you shouldn't do jelking when the penis is too weak, because it's not gonna be effective.

A detailed description of five different levels of erection is provided here to help you understand how your member should be erected in the implementation of the jelking and a number of other exercises. Each level of erection is measured as a percentage.