A change of partners aka echanges de partenaires (1976)

Synopsis
eric and joelle decided to spend their honeymoon night at the house of a couple of married friends – who happen to be in the midst of a serious marriage crisis before sunset, a very young woman arrives riding a motorbike, and says she’s angel with her strange presence, erotism breaks out, and several couplings and vicious sex erupt in the comfortable home

stars
karine gambier, joan keller, catherine rover