Last time I checked, in America, not California, you are free to do as you wish so long as you aren't harming someone else.
Ahem.... motorcycle helmet laws....
“Government has three primary functions. It should provide for military defense of the nation. It should enforce contracts between individuals. It should protect citizens from crimes against themselves or their property. When government-- in pursuit of good intentions tries to rearrange the economy, legislate morality, or help special interests, the cost comes in inefficiency, lack of motivation, and loss of freedom. Government should be a referee, not an active player.” - Milton Friedman