According to the customs and standard governing social life. The difference in traditions and customs between peoples can however be a source of reluctance towards the other. This can be seen in Kouamékro, a rural locality in the southern forest zone of Côte d'Ivoire. In this area characterized by exposure to a significant migratory flow of populations from the Central and Northern region of the country but also from neighboring countries because of the cash-crop farming practiced there, many inter-ethnic unions are contracted. In Kouamékro, as in several other settlements and villages in the south-west, the first migrants, the Baoulé people, lived almost in "autarky", isolated from the host people and set up their own social and political standard. Over time, the latter acquired the status of indigenous people with regard to those who arrived after them. Several national and non-national ethnic groups live there and many unions are contracted between them. However, the indepth exploration reveals a tendency for Baoulé girls to contract inter-ethnic unions, unlike men who only engage in intraethnic marriage. Faced with this observation, this article aims to understand the social logics that generate a strong tendency to inter-ethnic marriages between allochthones and "native" girls, while the men of this same group only contract intra-ethnic unions. Based on a qualitative approach, a study was conducted using semi-structured interviews with around thirty interethnic couples and men from the Baoulé groups in intra-ethnic unions in Kouamékro. Three main points emerging from the content analysis carried out account for the interethnic union relationship within these communities. They are on one hand a feeling of superiority and a "negative" perception of the other by the natives, on the other hand the matrilineal system, a social framework explaining interethnic unions in this village or even marriage which is mobilized as means of circumventing social boundaries and reconfiguring social ties.