(o) Sex differences in romantic avoidance and anxiety are reliable but typically small.
(o) Larger differences may emerge at the level of narrower attachment facets.
(o) The Experiences in Close Relationships (ECR) questionnaire contains 5 facets.
(o) In two US and Italian samples, larger sex differences emerged at the facet level.
(o) These findings open the way to the study of sex differences at the facet level.