as to what is right or wrong for personal choices? Why 21?

Should men be allowed to get vasectomies... or women to have tubal ligations? Should people be allowed to interfere with 'nature' at all? Should there be birth control pills, or even abstinence... which goes against "nature" or "God's" command to "be fruitful and multiply"?

Should parents be allowed to make choices for their children, or should they allow their children to make choices of their own, at what age? Or should the government make these choices, and to what extent? Ear piercings... tattoos... haircuts... hijabs... burkas... the clothes people wear... as in places like Iran with 'morality police'? Should school boards be making these decisions? The government? Or churches?

There was a time when school age boys had to have their hair cut short (above their collar) and their shirts tucked in... and girls had to wear dresses that went below their knees... and it wasn't that long ago. And in those times, girls would disappear from schools (if they became pregnant)... which was better than condemning them to death as per biblical instructions... right?

Where would you draw the lines?