I am excited to hear that you have this desire, as it is our vision and mission to empower couples to have life-long marriages. There are several keys: First that couples are at the same level of development in crucial areas such as consciousness, emotions, sexuality, spirituality, and anima/animus complex. Second that they have an agreement to further learn, heal, grow and awaken together. Third that they engage in frequent novel oxytocin producing romantic activities that keep their love fresh and alive. Forth that they have a healthy sex life. For modern and postmodern couples it is also important that they have a shared transcendental purpose, as the traditional divided gender roles often no longer apply in these relationships.