So we can be certain that a body double was indeed hired.
Also Maeva Pasquali naked in A dix minutes des naturistes.
Check this out I can safely say that I am now 80% sure that it is the double, Eliska Cross performing the blowjob.
So I've included in this post a number of screenshots I took some of which could perhaps lead us to the truth.
In Le Beau Sexe she performed a blowjob and clear visuals of penetration that caused outrage in France.
But then again I could be wrong here, and heck I wish I am wrong.