Sex is a natural act - between a man and a woman who are married. Sex for money, videotaped and distributed via the internet is NOT a natural act.
The whole premise of this guy is flawed. It’s “natural” for dictators to do what they do. “Natural” for rivals to kill each other. “Natural” to lie, steal, cheat, and kill when somebody stands in your way. “Natural” to riot when you’re mad.
If something being “natural” means it is good, then there would be no need for laws, since people left to their own devices would naturally do the good thing.