Most libertarians agree that all rights are, in effect, property rights, beginning with this fundamental right to self-ownership and control of one's own life. As owners of their own lives, individuals are completely free to do absolutely anything they wish with them — provided, of course, that it doesn't violate the identical right of others — whether the people around them approve of what they do or not.

(with Rylla Cathryn Smith) What Libertarians Believe, "Introduction: The Zero Aggression Principle," 4 January 2009

What Libertarians Believe, by L. Neil Smith and Rylla Cathryn Smith