I used to see whole families on 125cc bikes or vespas or even 50cc moped scooter things in Jakarta Indonesia... sometimes they would carry enough stuff that most americans would need a SUV for.... 3 kids a baby in a sling, mom and dad, a crate of chickens and all sorts of odd crap handing off the thing....
it was pretty common to see that.... thailand was a lot the same way... actually I think that picture of the guy above with the plastic mountain on the bike was taken in Indonesia... I swear I've seen that guy before
as far as helmets go... that is rare to see in most countries outside north america and europe (well you can include Oz and NZ too)
safety is not a high priority.... just look at some of the busses