Am I missing or is it penis fatigue/other factors?

[btraws5]

I pretty much have the same technique every time - plump up well, go in, dimple, and push the plunger… and yet it is all or nothing for me. Some days, 3 hour erection, some days it's like absolutely nothing was injected.

If this was penis fatigue, I feel like maybe I should get a weaker erection, or one lasting for a shorter amount of time, but the fact that sometimes there is nothing makes me wonder.


Could this be a case of viagra/pills in general, where the exact same input into your body can produce different results depending on the day, what you ate, etc.. Or am I really just not penetrating the tunica that often?