so if someone decides that he wants to be a nudist, he has the right to do so in terms of freedom of expression,
but in terms of laws against public indecency, which is defined as unlawfully, intentionally and publicly committing an act which tends to deprave the morals of others or which outrages the public’s sense of decency and propriety it would be illegal.
That person is then being blatantly discriminated against and could then rightly go to the constitutional court and claim that the legislation is unconstitutional and must be changed or rather that that common law principle not be applied in South Africa
The result of that would be that many sexual offences would have to go unprosecuted, despite the number of naked people walking around your office (look around you and think about it before you say good idea

)
My point is that just because the constitutional court, purely on the basis of the constitution and the legislation before it, deems it to be one way, does not mean that it is morally the correct position to take.
BTW - AFAIK common law against sodomy and bestiality is still applied in terms of our law