m8 take a look at this
https://en.wikipedia.org/wiki/Koro_(medicine)
Well, mine too. One would learn French just to be able to read it in the original language, it's even better. It's all in verse, the whole play, but it never bothers anybody. Totally brilliant. Btw, Cyrano de Bergerac was a real person, who lived in the 17th century, a poet, writer and soldier. He's the real founding father of what's known as "science fiction literature". He was the very first one who wrote about a scientific way to travel in space and visit parallel worlds, in order to make social critics on his own society. And his nose wasn't all that long either, and he never was in love with Roxanne: he was actually gay... But the play is unbelievably beautiful. Among the best plays of all times ever.
Although your nick refers to someone who was no small potatoes either, Euripides!
That's a mental disorder, not a real disease that can be cured by mere things like massages, that's not the same thing. What this article refers to, is some sort of male version of anorexia: those are called dysphoriae. It means you are convinced there's something wrong with you, but there is'nt. It can be anything, but it's usually about a typical "weak point" in your self-image. For girls, it's their figure, and for men, it's the size of their penis. If your insecurity is that bad, you can start imagining things that aren't there, get very upset and do yourself harm.
In this manga they're taking it literally, not as a mental disorder. That's what doesn't exist. And whatever one may convince himself, penises dont shrink, unless you sit down in a bucket of ice water, with no pants or underpants. Then, it shrinks, yeah... but not into oblivion, though.
This is a hilarious and pitiful subject. Isn't it?
Didn't want to sound pedantical though. I just care a lot for youngsters, and knowing how fragile their self-images are, I didn't want kids on this forum taking this thing too serious and start to imagine things about themselves and get scared. Once an insecure kid, beit girl or boy, gets a thing in their heads, it can go real bad.
there are these countries where kids don't get any sexual education at all in school, and if they'e to learn everything they'll ever learn about their body from either porn or comics, they are at the mercy of what the porn makers or the mangaka make...
So, once again to all you boys: penises don't shrink, unless temporarily due to cold temperature (and once you get warm again, it turns back to it's original size), but not from any type of disease, unless you start imagining it and take your fears for reality! Everything else is in your head, and that you must fight with all your strengt and good sense.
Oh, and an other thing: massaging of the prostate is definitely a good thing, but for no other purpose but for pleasure. At least for young boys, that is. For older men, it can actually do help cure things like prostatitis or prostate hypertrophia.
There, I hope I've put all the scared boys at ease. I wish I could do the same for all those girls who weigh 45 kilos and still are convinced they're fat...

To everybody who's getting worried:
THERE'S NO SUCH DISEASE!
trust me, there isn't X"D "XD X"D