El Topo
Ah, that maddest of mad movies.
Alejandro Jodorowsky's insane El Topo had a bit of every extreme, so it's hard to imagine there not being any lesbian subtext to it.
For the uninitiated, this Mexican cult Western is an allegorical look at life via the titular gunfighter's quest for salvation.
Anyway, without spoiling it for those who haven't seen the film, while there isn't an actual lesbian relationship spelt out between the unnamed woman gunfighter and Mara, their dynamic is constantly sizzling.