Starwood does not combine but allow you to transfer into your spouse. Following is part of the email that I received>

We are unable to allow combination of individual accounts, whether for spouses' accounts, or for other members of your household. However, we do allow unlimited Starpoint transfers between accounts of members in the same household for redemption purposes, if the following requirements are met:

1. Both members live at the same address.
2. The member whose account is being deducted must advise us of his/her password.
3. Neither member is an employee of Starwood Hotels & Resorts Worldwide.