@Devil, not sure how serious you are but second marriage can be disastrous legally.
If you are seriously considering marrying again, you must make sure that there's no proof of your marriage in which case it becomes a live-in in legal parlance and that's not illegal.
Proof of marriage can be photos, videos, pundit, witnesses etc.
Yes, this is the only way to teach the scrupulous "first" wives. Also, note that they can't adopt the same method since that adds another arrow in your quiver in the form of adultery which will strengthen your divorce case and also eliminates maintenance.
Legal experts may correct me.