I've been getting that "under the left cheek soreness" again, but I'm curious as to why I only get it on the left side. I pull with the same intensity in all directions. Shouldn't I be feeling it on both sides?
For some men, the ligament is on one side or the other. And this would explain why you're feeling more fatigued in one side. Do you have any curvature? This could also be the reason you're feeling that fatigue but if your penis is straight , it is definitely your ligament