Here's the excerpt from the Romance Rewards terms and conditions.
"You cannot have more than one account per household. If you are incorrectly assigned more than one account, you should call the Romance Rewards Department to have one membership cancelled. Nights Stayed may not be transferred or assigned. Corporations, companies, associations and groups cannot enroll in the Program."
I know because we originally signed up individually and tried to get one eliminated, but no response from the Romance Rewards department. This was 18 months ago.
Mike & Martha
CSS 2010, 2013