Way back June of 2006, was riding a Yamaha Crypton R. Na slide ang ligid at about 35-40kmph na bagnos ko sa daplin sa karsada, face first. No helmet or gears whatsoever. My face got some serious damage, and about an inch cut on the left side my head, several cuts and bruises on the body luckily no broken bones. My face bears the scars of that accident, the most prominent is on my nose.
It reminds me always to wear a helmet and be a defensive rider and it's your not 100% sure don't go for it.