I have worked in many countries with similar culture and regulations, where people weren't allowed to have sex before getting married etc. However, I heard from local residents that in facts, most of people do have sex "unofficially", as someone above already said. Similar thing is with drinking for example. There are places where you can't drink alcohol in daylight so everybody is drinking in basements, literally, where they can't be spotted. I believe people that live in countries with regulations like these are just used to them and know how to deal with them as well, so assumingly they don't consider it as that big problem as we do