Richard, I have no problems with you asking what Endometriosis is, but since the first post from you was:

Where is the "endo" on a man, anyway????
and not "What is Endometriosis?", I hope you can understand why I got a bit annoyed.

Men CAN get Endometriosis, but normally it's in the arms/shoulders as far as I can recall and is very rare.

Google 'Endometriosis'.