Using jockstrap(supporter) while running

Here is an answer from now dysfunctional Google Answers service.

Question was whether running too much without an athletic
supporter (also known as jockstrap) could cause erectile dysfunction?

"
While there are several accepted causes of erectile dysfunction (ED),
including medical conditions (illness, hormone imbalances, especially
Diabetes), emotional/relationship issues and certain medicines, I
couldn't find any information linking running/jogging without an
athletic supporter with ED.

Running without an athletic supporter may lead to minor injuries
(depending on one's stride and speed and the size of one's
penis/testicles, general fitness, et cetera) that shouldn't have a
lasting effect because when they happen, the person immediately stops
the activity to deal with the discomfort and/or pain involved. If
someone is running 3-5 miles a day for a long period of time without
experiencing any pain, running would not likely be the cause of ED.

Athletic supporters mostly provide safety from contact injuries
(bruising and rupture) when worn with a cup, and discomfort otherwise.
"Some advertisemnents refer to preventing strain on the scrotum and
spermatic cord, but these may be overrated. European soccer players
seem to get along fine without athletic supporters." from:
http://www.infernosoft.com/community/hockey/jock/jockstraps/

It also notes that athletic supporters do not prevent hernias (related
to strain on the scrotum and spermatic cord). Although you didn't ask,
there was no evidence found supporting a connection between a hernia
and erectile dysfunction, though logic would indicate what if there is
an injury, obtaining an erection may be painful or impossible until
the injury has healed.

If this is your situation, you should talk to a urologist or your
family doctor about the situation, as there may be some underlying
cause that can be corrected with treatment or should be under medical
supervision. In these situations, the sooner the better. This answer
does not constitute medical advice, per the Google disclaimer below.
"