I think doctors are opposed to it because in their view, it’s unnecessary. “If your penis is working properly already, then why risk injuring it to add another inch, they think.” Also, they can’t charge you for an expensive, safe procedure to have it done. It’s also really hard to learn about it from word-of-mouth, popular practice, which is how most types of exercise become popular. How did Yoga become so popular? Not because doctors recommended it, because people gradually told their friends: “hey, I feel great ever since I started doing this Yoga stuff.” PE might eventually become popular in the same way, but there is also a strong barrier to it, which are the facts that our penises are rarely seen except in intimate situations, and that also our culture is quite uptight about sexuality in general, imo. If you suddenly get really thin and muscular, your friends will comment, asking you how you did it. “You’ll say, I worked out at the gym 5 days a week and changed my diet.” Then your friends will start doing those same things to imitate your success. But even if your penis suddenly gets bigger, other men aren’t likely to notice because they rarely see it. They’d also probably be way too embarrassed or homophobic to say, “dude, your dick looks twice as big as when I saw you last year, what’s your secret?”
I’d be willing to bet that most people (myself included) probably are not nearly as good at sexual technique as they could be because it isn’t thought of something you can train, like say martial arts. Sure, sex comes naturally to humans, but so does fighting. And yet by training martial arts you can become a thousand times better at it than you would have been just using your natural instincts. But who takes a training course on the art of sex? Only perverts and weirdos (in our society’s estimation). By the same token, who’s going to spend hours using unusual and potentially dangerous devices trying to enlarge their penis: again, only perverts and weirdos (again, in our society’s estimation).
I know this is a selfish attitude, but I’m personally kind of glad PE isn’t yet well known. If it were then there’d be yet another unreasonable expectation on what men have to do to be considered attractive. For example, fifty years ago, and in most other countries today, men were not expected to have 6% bodyfat and fifteen-inch biceps to be considered really attractive. Now, in America, they are. If PE becomes popular I’m afraid everyone will be expected to have at least 8” and if you don’t “you must just be too lazy to take care of yourself.”
Oh, also, most people have the impression that because there isn’t any muscle in the penis, therefore you can’t cause any kind of hypertrophy/that its overall volume is set. I used to think that even if you stretched it to gain length that that length would come from your girth.