I sincerely hope you never end up in a divorce situation but during mine (under California law) I had to give up 50% of my equity and options rights in the startups I've been involved in that occurred during the marriage because they were 'community property' (ie owned by the couple).
I'm not a lawyer, but if you have your own startup and your wife isn't a shareholder and you divorce she is entitled to 50% of anything you vested during that time. It works both ways if she is also involved in startups (ie you would get 50% of hers) and to that end you could agree to trade/cancel things out. I was able to buy my ex-wife out because I didn't want her to remain involved in the company but it was very costly. There's a longer and more gory story in here but this isn't really the place to get into it plus confidentially issues come into play.
When you get married, you don't really want to think about divorce. In the same way when you form the company documents for your startup, you don't really think about an IPO or an exit - yet in both cases at that end point some of the decisions you made at the start will come into play and so it's important to get things in order now.
EDIT: Another tid-bit of info - if you exercise options or sell the company your spouse has to sign-off agreement on the documents. Again, if you end up estranged from your wife that can cause all kinds of delays and issues.