Here is my summary:
I trim with an electric trimmer (not razor) but get pretty darn "close" if you know what I mean.
I definitely find the ladies treat me nice because I'm trimmed. I always get BBBJ and usually rimming no problems. They seem very comfortable getting the tongue into all of the nooks and crannies because they don't end up pulling pubic hair out of their teeth for a week afterwards.
That being said a dude has to be real careful reaching around to do the ass area solo... best to find a friendly lass to help...
As for sweaty ball syndrome... let me recommend the world's best underwear... "ExOfficio" synthetics in boxers or boxer briefs. They rock. Not cheap, about US$25 per pair but they are wash and wear and very durable. If you have seen the movie Oceans 13 the Night Fox lifts a pair to examine when they are in the REI store buying the winter jackets for the crawl in the A/C system... I've put tons of my bro's onto them and they all swear by 'em. I live and work in a very humid climate...
I'm clean shaven but don't shave any other body hair, I'm not that hairy actually.
Oh yeah, I think it does make your dick look bigger.