I am sure many will disagree.
When I had the Honda I wrapped it good in heavy plastic with lots of duct tape to make sure it was as air tight as possible and I never had a problem with rust. Two years ago I just threw a cover over it leaving the wheels partialy exposed. When I took the cover off in the spring there was minor corrotion on the chrome rims. Last year I wrapped the bike up like with plastic and duct tape and found no rust when the cover came off.