"temproral laws have set age limits to sex which, I believe are quite adequate,"
I suggest you research the subject just a little!
Saudi has no minimum age and no one protests. If the country was just sand and no oil their repressive practises would lead to international outrage. But it is all very quiet! child brides and more recently-still just hot air no actionunicef
http://www.arabianbusiness.com/no-minimum-age-for-marriage-of-girls-grand-mufti-576044.html

And of course modern day slavery. One example a few years old linked below.
camel jockeys