I'm not DLD, but I will chime in.
Its not dangerous if you educate yourself, as Stillwantmore2 posted above, this will minimize the chance of injury.
Hanging done correctly is very safe, and we have an excellent
hanging section
here
You don't do it while erect, but while flaccid. Those who do it erect are not adhering to the traditional tried, tested, and proven works of
hanging.
Erect
hanging is best left to those who wish to take risks, experiment etc but we don't recommend it here.
Girth work with a pump is useful, and can translate over to permanent gains. We got a good
bathmate forum
here.