What on earth was that man doing letting an in-season bitch off in the woods?
I find that really irresponsible TBH
I have an entire 3 year old working cocker - coat is pretty irrelevant to me in the pro's and con's of neutering.
Yes, if he's exposed to off-lead in-season bitches then of course he's interested and there is a potential issue
He's not aggressive, he doesn't hump anything (apart from one particular toy when he was a pup!), and we check
his bits regularly to make sure there are no changes. If there were any changes in his temperament or if he had a medical issue then yes, I would have him neutered but as it is I'm with cob-web on this...
I would say you have to take responsibility and be a bit more vigilant - you can obviously relax a bit more if your dog is neutered