The penal shrinkage is only temporary, It all has to do with blood flow to the penis. If you are not aroused, or if vessels aren't dialated enough (which is where the
Cialis works on), then it will be small and flacid. T does not increase the size. When your T levels are high, your libido is generally high, and there is arousal, increased blood flow, larger penis. Even when you are just "hanging" around and not aroused, it is usually larger with optimal T levels. This is not permanent.