Many men particularly wish for a thicker penis, i.e. a larger circumference of the penis. On the basis of the long-term application of a PeniMaster expander it is also possible that the penis becomes thicker, because the stretching of the penis may stimulate the three-dimensional growth of new tissue within the penis.

Therefore, it is not possible to only thicken the penis with an expander in a targeted manner; due to the principle, the penis becoming thicker must be regarded in connection with a probably occurring penis elongation within the framework of a possible penis enlargement.