No. Under Article 1 of the Kuwait Penal Code (Law No. 16 of 1960), an act is not considered a crime and no punishment can be imposed unless there is an explicit legal text defining it as such. This is the principle of nullum crimen sine lege — no crime without a law — and it is a foundational protection for everyone in Kuwait, including expats.
Article 14 reinforces this further by stating that acts are judged according to the law in force at the time they were committed. You cannot be prosecuted under a law that was enacted after you performed the act in question.
However, there is an important exception in your favour: under Article 15, if a new law passed after the act but before a final verdict is more lenient than the old law, the more favourable law must be applied. And if a law passed even after a final conviction completely decriminalises the act, that new law still applies and the conviction is extinguished. As a practical tip, always consult a licensed Kuwaiti lawyer if you are unsure whether a specific behaviour is regulated, as local customs and regulations can interact with the Penal Code in unexpected ways.
This is general legal information, not legal advice. For advice on your specific situation, consult a lawyer licensed in Kuwait.