Its causes are multiple. There is a reciprocal and interactive relationship between cognition, emotion and behavior. No ONE theory of human behavior is adequate. The pathology model is too limiting. The family is basic.
Human beings are unique.
To love and to be loved are necessary. Sex differences and similarities both exist. Committed relationships take effort to maintain. Parenting is challenging, growthful, joyful. Summarize your own philosophy of life, interpretive criteria and basic assumptions.