Certain states that do not recognize same-sex marriage offer an alternative way for couples to legal affirm their relationship with one another. This is often accomplished through a domestic partnership or civil union. A domestic partnership agreement is a one or several legal documents that outline each person's rights, responsibilities and obligations to one another while the couple is in a relationship and in the event that a relationship ends. A family law attorney or law firm with experience representing LGBT couples can assist you in drafting a domestic partnership agreement. Domestic partnership lawyers can also advocate on your behalf in the event your relationship comes to an end.