Simple meaning of social rituals .​

the habitual activities that structure the lives of communities and groups.

Explanation:

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Social practices, rituals and festive events are habitual activities that structure the lives of communities and groups and that are shared by and relevant to many of their members. ... Rituals and festive events often take place at special times and places and remind a community of aspects of its worldview and history.

intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.