Keeping them seperate from your wife though adds certain protections if you own and operate it before the marriage.

If you can come up with a marriage contract that successfully addresses the same subject - kudos!

If joint money (ie. since the start of marriage) is used for the LLC, he may have a claim later.  

Just marriages.

Or...will these things become more like a dating site where a bunch of matchmaking takes place and marriages happen, or not, and some dates result in disaster.  

Even if there are no parents and children, there are often nieces, nephews, aunt and uncles, cousins and other further distant relatives, whether by blood or marriage. 

This is mainly because a JV is like a marriage, plus cost money to set up.

She is planning marriage to a much younger man in 2013 and even though she plans on a pre-nup, she's not taking any chances.

As to splitting things up in the marriage, absolutely not fool proof, there is legal theory of who is behind the door, you have comingled assets, community property, shared interests even if you are not in title.

Borrowers are eligible for maximum FHA loan financing for non-occupying borrower situations for FHA loan applicants who are related by blood, marriage, or law.