SteveR said:
For healthcare insurance of course
After my mother divorced my father she dated one guy for 19 years, and when they finally married it was so he could be covered under her healthcare policy. They loved each other too, but that was not the impetus for the marriage
I suppose my own family history colors my perspective on prenups; my own parents divorced after 6 or so years of marriage despite having loved each other quite a bit in the start. My sister, who is the most skilled person at relationships I know, divorced her husband after just one year because she just decided she didn't like him so much after all.
As I think about the prenup I would write, it occurs to me that all I'm really looking for is a confirmation of the basic community property law: We both take out what we came in with, and half of what we made during the marriage.
The reason I don't trust this is that I constantly hear anecdotes about people losing half their pre-marriage assets in divorces. I wonder if this really happens often in real life, or whether it's just something like school shootings that does happen but not enough to require defensive action.
One thing that may not be obvious is that prenups don't and can't say anything about how child support will be handled (especially if you don't have the kids when you enter the marriage). I wonder if most of the people who lost their premarital assets in divorces lose them because of children in the mix. If that is the case then a prenup obviously wouldn't help, and I am not looking for protection against that.
Another question is how on a practical level to avoid comingling accounts if you are ER. ER means you are taking withdrawls, so by definition some money from the pre existing accounts is entering the "marriage domain". Perhaps the accounts aren't considered comingled if you are only withdrawing, not adding money. Even if you're not ER it seems likely that you would want to take money out for things like home down payments or smoothing cash flow issues. Using your accounts to smooth cash flow issues would involve round tripping money out and in to the account, which seems very likely to cause comingling.
I suppose the ultimate way to avoid comingling accounts would be to divide your assets up into lots of small accounts and withdraw from one at a time until it gets sucked dry and then on to the next one. Yech, what a hassle. And how unromantic :-!