Interesting replies so far. When you say "naughty", I thought of an entirely different type of naughty. Perhaps just my naughty mind, but here are a few:
1. French kiss (as long as its your wife).Don't dare use that tongue elsewhere.
2. Wear logot-shirts (as long as no crosses, references to alcohol or sex or demonic music bands).
3. Get drunk (as long as its just once, its an accident, and you're at home).
4. Smoke a cigarette (as long as only one and it was an extreme moment of weakness and you hated it and make an oath to never do so again)
5. Wear a bikini swimsuit (as long as your bodyisn't so sexy that you make the elders wives feel inferior and the elders drool)
6. Not wear underwear (as long as no one can ever know)