It used to be Ok, Not any more.

This practice is called "piggyback". What happened is in recent years, there are lot of business charging to improve your credit score by doing this. So FICO changed the rules, by adding your hu*****and on your card will not improve his score any more. If you want to know and learn how to help your hubby, try to watch Suze Orman show. She is a great financial advisor.
Too many checks on your Fico score in a short period of time by creditors will lower your score. If you check your own scores, it will not affect your scores at all.