No air time for the nads in Colorado
From the Colorado Statutes:
42-4-1502. Riding on motorcycles.
(1) A person operating a motorcycle shall ride only upon the permanent and regular seat attached thereto, and such operator shall not carry any other person nor shall any other person ride on a motorcycle unless such motorcycle is designed to carry more than one person, in which event a passenger may ride upon the permanent seat if designed for two persons or upon another seat firmly attached to the motorcycle at the rear or side of the operator.
(2) A person shall ride upon a motorcycle only while sitting astride the seat, facing forward, with one leg on either side of the motorcycle.