This only because they have their own system in place, as it is included in the constitution. SA, became the first African country in 1996 to end discrimination against Gay people, whether in an act of Law, within society or in the workplace. Follow link: http://m.news24.com/news24/SouthAfrica/News/sa-abstains-on-key-un-vote-to-end-discrimination-against-gays-20160705