Okay, but just to clarify things, most generators have the yoke of their 3-wire receptacles in direct contact with a metal panel that is also connected to the generator frame. There usually is no way to bond the receptacle grounding terminal to the neutral conductor of the generator receptacle without also bonding the frame and vice versa. There may be some that have this ability, but it’s not a very common feature from what I’ve seen.
I don’t see why putting yourself between the line and "neutral" wouldn’t result in current flow or why giving it a second path to an independent "ground" couldn’t still allow enough flow to cause trouble for someone.
My generator is pretty typical. Each side of the 20A/120V duplex is connected to one leg of the generator, so 240V between hots. With a 500W load [halogen work light] connected to one half of the duplex receptacle, I can read 56V AC from the hot of the other half of the receptacle with no connected load to an independent building ground using my Fluke 337 meter.
It seems that the hazard could possibly increase when multiple loads are connected to the receptacles at the same time.
