We do the keep on ice thing for 7-10 days. We have had both pigs and deer stink when cooking. All game goes to the test sniff now. If it has that strong musk, its done away with, IE we aren't going to eat it.
That said I've shot old rutty bucks and old boars and sows that didn't smell a bit really and were fine to eat. I"ve had to donate or get rid of 50 pound piglets and 2.5 year old deer.
Could be something like my one nephew... that boy has hormones even at 30. I stink when I sweat, he will run you out...
