And keep in mind through the magic of commingling they will probably get half of whatever you had before the marriage too. Good luck keeping it's status as separate property.
Basically in a divorce you are fucked unless you can keep everything amicable and do it via mediation. Otherwise you will either lose all your money to the other party or to the legal system. That was my choice - I could have paid less alimony but I would have had to spend $100k in legal fees for a chance that I'd get a sympathetic judge and things would go my way.
Honestly, if my wives (and near-wives) hadn't raised the issue of marriage, I would have never considered it. But then, I've never wanted kids.
Edit: clarification
As I recall, they were both no-fault divorces. And they were some decades ago. The first was in the late 70s, and the second in the mid 90s.