This research in the area of social philosophy is a creation of an integrative theory, which addresses the question of what makes a marriage a lasting marriage. Sources of information are scientific results of different specialists in the field of close relationships and marriage. In the process of research and reflection, the following social-scientific theory arose: the dynamic of a lasting marriage is realised through such drivers as Meaning, Love, Commitment, Trust and Ritual. This dynamic is realised by interaction of these drivers. Love constitutes the foundation for all close relationships. The metaphysical basis, meaning, is necessary for the emergence and existence of commitment. Commitment fosters and encourages love as an attitude. Ritual is commitment expressed by actions and is responsible for loving actions. The most vivid and experimental of them is the sex act, in which all drivers of the dynamic of a lasting marriage are realised practically. It takes meaning from the highest purposes, such as morals, expediency, duty. Sex is an expression of love, and its repetition again and again is indeed a ritual. And in order to support the exclusivity, frequency and custom of this love and ritual commitment is crucial. For full realisation of sexual intimacy, which arises from love, ritual and commitment, we need trust. This way the sex act is an existential means for the interaction of all drivers of a lasting marriage.
Contribution of this work consists in unifying already studied and known drivers into a joint structure, where each of them in its own right contributes to emergence, maintenance and strengthening of close relationships.
The newness of this research consists in the dynamics of interaction which creates an existential structure which maintains and fosters a lasting marriage, as an emerging property.