It's all up to you. I personally only shave my face. Some men go wild, and shave everything (this is a bit too far) in my opinion, men only shave their entire body if they are swimmers.
If your brave enough to shave around your coin purse, more power to you, but once you do it you gotta keep up with it, or it can get itchy.
A lot of men shave their chest, and back (or have their back shaved i should say) again, it depends on how hairy you are. If you shave your chest you also need to keep up with it, or it can get itchy.
Oh, and it's a tad weird for a man to shave under his pits, but that's just my opinion.
Lastly, arm, and leg hair i believe are perfectly normal for a man to have. It looks a little odd if you shave it off. Hope this helped!