AFAIK some state laws have this feature; the wife only gets half after ten years or something.
You mean 'spouse' right?
Edit: Granted, there may not be very many instances (or any for that matter) where the man is going after the woman's wealth, but the point is that the provision applies to both parties.
The courts do not favor the woman, they favor the spouse in the weaker position financially, especially if that spouse was the primary caregiver. In most cases, this is the woman.