More from Robert A. Heinlein
Sin lies only in hurting other people unnecessarily. All other ‘sins’ are invented nonsense.
Time Enough for Love (1973).
People/Robert A. Heinlein/Quote

Women and cats will do as they please, and men and dogs should relax and get used to the idea.
Glory Road (1963)
Sin lies only in hurting other people unnecessarily. All other ‘sins’ are invented nonsense.