Research about sex addiction and its relationships with other constructs remains unexplored.We recruited a gender-balanced sample (53 men, 51 women) who responded to measures of sex addiction, adverse childhood experience, adult attachment, narcissism, self-compassion and motivation. Sex addiction was found to be statistically significantly associated with these constructs. Anxious attachment statistically significantly mediated the relationship between adverse childhood experience and sex addiction and the relationship between narcissism and sex addiction. Self-compassion did not statistically significantly moderate the relationship between anxious attachment and sex addiction. Therapeutic approaches targeting attachment and narcissism such as relation-based or mindfulness-based interventions are recommended.