Cohesion has its advantages in the financial world - price breaks on insurance premiums save money by splitting bills, instant justification for buying the big bag of Doritos family, etc.
However, if it comes to credit, too much togetherness can be bad for the end result. Although there is no such thing as a "couple" or "joint" credit report if you are both named for a loan or listed as a co-owner, all the river-up (late payments, default) mar the account both of your files, no matter who forgot to put the mortgage check in the mail. Couples need a little selfish, to their be healthy. Should the unthinkable "d" words come (namely, "divorce" or "death"), do you stand on your own feet, creditwise. You do not want Mr. or Ms. Wrong mangling your credit card. A few simple moves now things harmonious on the home front - and in your files.