Feel free. And realise the massive financial risks you are taking by being legally tied to someone. Especially someone who does not have the same kind of emotional bond to you as a genuine spouse hopefully would.
A prenup is insufficient unless you're also in a legal environment where a spouse can not financially make both of you jointly and severally liable for a debt, for example.
It doesn't help you if the other party doesn't get any of your stuff in a divorce if you're still saddled with debts they took on while you were married.
There may be places where this is possible, but I doubt it'd be worth it once you factor in the cost of sufficiently safeguarding yourself, unless there are massive amounts of money involved.
