Appreciate the sentiment and agree with most other comments here.
Even though most people view it emotionally or under whatever religious pseudo authority, marriage is explicitly a contractual relationship similar to a business partnership. That contract creates specific financial and other obligations, liabilities, and privileges that you agree will be overseen by an authority that is in most cases a family court with incredible latitude to make determinations that heavily effect your life and that of your marriage/business partner. So, maybe take it at least as seriously as you would starting a new business with someone.
Maybe it should be the Parasite Phylum?