Eldar, you want to come and see some of the loons out here in Thailand
Most of the local girls tend to ride pillion on one form of bike or another If they've got short skirts
on they will ride side saddle. Invariably they are reading, chatting on the phone, eating or drinking (or any combination of same), anything but watching where they are going. They hardly ever hold on to the riders, or bikes, with their hands, and never have their feet on the the pegs (the flip flops or strappy stilettos they all wear wouldn't afford much grip there anyway). The riders bob and weave through traffic at insane speeds, yet these girls never fall off
To my mind either they are born with a phenomenal sense of balance (most orientals are actually, see the size of their big toes), or they have developed superb control over certain muscles in the lower abdominal area that help them grip the seat
Having born witness to some of the nightclub 'entertainment' in this part of the world, my opinion tends toward the latter
Back on subject, I personally don't think it can be governed by height alone, age and ability must have some bearing. My neice is 3'6 at 5 years old and is extremely competent on a pushbike already (to the extent that my 18 year old stepson is trying, at her insistence, to teach her how to wheelie
), she would probably grasp the basics of a little 50cc twist 'n' rip quite quickly. In contrast, a friends son, who is 12, and just shy of 5', is not safe left in charge of his own feet, let alone something with wheels on it.
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