If the couple wants legal status designating that previously unrelated individuals should henceforth be treated as a legally related group, then government must be involved. Being legally allowed a relatives-only visit to a hospitalized parter, for example; or legal standing in probate, for another; or legal responsibility for a child's actions -- is the partner legally a "parent" or just someone who happens to live in the same house?. Such legal acknowledgement does not have to be called "marriage," nor does it have to be conflated with any religious practice.