I liked "Basic Instinct" as guilty, enjoyable "trash." Elle is a different story, as it has arthouse pretensions.  Complex film, but I suppose what I found most disturbing about it, is in its reliance upon the rather suspect, even preposterous, trope of woman "getting off" on being violently raped.  In this case going so far as the desire to "date" the rapist himself.  The rape scenes are brutal, much worse than the "tunnel rape scene" of another French film IMO.  Can't recall its name. It is both amazing and quite unrealistic there were not broken jaws, blood on the face, knocked out teeth, etc...  Whilst the FWB/attacker tore into her face like Mike Tyson without gloves. Just a brutal, perverted, audacious, film IMO. Well worth checking out if one can handle the violence.