I don't care if it's a moped or a scooter, but on the very rare cases I venture onto a motorcycle taxi, I usually have a cute rider & being so green I have not found the grab handle, I have to hold on tightly around the waist of the rider, with my hands clasped together resting on his lap.
Admittedly the last time I used one must have been in Cambodia about 5 years ago. But at least I try to make the most of it.