In and Out (2017) on Netflix

Plot summary

Pierre and Aimée, in their forties, have been married for years and are raising a son and a daughter. Their friends Éric and Pénélope are planning a wedding so that they will be allowed to adopt a child. The two couples have shared four years of friendship without any trouble, except that Pierre and Pénélope have become lovers. When the affair becomes untenable, they decide to break it off. One last night together changes things: each of them wakes in the body of the other. To keep their secret, each now takes on the other's daily life: the household, the children and the wedding plans.