Pirola:
Over-pumped cocks look different. However, most guys don't over-pump, over-eat, over-exercise, or over do it with any activity.
In the John Holmes' documentary "Wadd", one of his frequent partners says that his cock was never hard, it was "like a loofah". Why? Because like ALL porn stars, Holmes used a vacuum pump.
So why don't they admit it? Have you seen the movie "Austin Powers: International Man of Mystery"? Do you remember the Quartermaster scene where Powers denies that the Swedish-made vacuum pump is his, despite the over-whelming evidence that it is his? Most guys who use vacuum pumps, especially porn stars, are in denial.
However, some admit it. For example, Jeff Stryker has an expensive magazine-type book available with photos of him pumping. He does NOT look pumped in his porn videos, but he definitely pumps. That's how the porn stars do it, just enough but not too much. However, they undoubtably go overboard when pumping when not scheduled for a video shoot, so they can enlarge a lot.
This thread is in the wrong category. There is a penis enlargement category on LPSG where this belongs. And frankly, I became bored to death discussing vacuum pumping many years ago. For me, it's just an enjoyable exercise I do every day.