>>3053169Well, a penis is mostly tissue. It has some muscles but they deal with stuff like expelling urine and forcing in blood to get an erection, e.g. functions that don't really correlate to penis size. So while I think we can confidently say that Cap likely pisses like a racehorse, has strong boners that he can maintain for a very long time, and has an extremely short refractory period, I don't think it's necessarily self-evident that the serum gave him a bigger dick.
If I had to guess, I'd say that his dick increased in size in equal proportion to whatever the serum gave him in terms of tissue/ligament/etc growth across his body generally. Which means that how big his dick is now depends a lot on how hung he was pre-serum, which we have no way of knowing.
