I know nepfew and some of his and his wife's friends and they are young and borrow each others boats and cars, swap their old honda's and kaw's motorcycles for the weekend type of thing.
That's fine..but to borrow a $15-20,000 dollar Harley and ride it's several states away in traffic on a permit and sure insurance would lov that if something happened and i'm sure there will be some drinks flowing...maybe they try hot roddin" the bike..parking it way out in some saloon parking hundreds of yards away...crowded parking lots ..scratches from nowhere showing up??
I do it...on my own bike.
Its owners decision... and Sister and I are just jerks I guess!!