Been trying to identify this film for ages. I saw it on an old grainy clip on VHS years ago and my fantasies regularly return to it!

Approx 1970-19080 era.
Lezdom (i know this is not

1st scene: female is being trained by another female to lick her cunt.
The Domme then introduces the sub woman to the joys of 4-finger hole penetration: 1st cunt then anus.
The slave is fully shaved, brunette, straight shoulder length hair, petite, small pert tits.
Domme: natural hair, light coloured blonde perm, ample ish bust.
After the slave girl enjoys a womb-splitting orgasm on the 4-fingers in each of her sex holes, the Domme suggests that they go to a friend of hers, a Domme more into "kinky" stuff. The sub says "Until a few minutes ago, i thought that was kinky, so yea, why not!"

Next scene is in a playroom, with another Domme sitting in a throne, tapping a crop on her boots.
This DOmme is similar to the 1st: blonde, perm.
Memorably, the scene is accompanied by the organ toccata from Bach (sinister mood music).
The 1st domme and her sub enter and the sub is introduced to the throne-sitting Domme, who starts to fondle her and tells her she is about to have her "1st lesson in bondage".

Next scene:
slave / sub is now totally naked except for a wide leather belt cinched up tight round her waist, her bare feet spread wide by spreader bar, held onto her ankles with leather strap on cuffs, padlocked in place. Her wrists, similarly cuffed are stretched up to an overhead bar. Her toes are just touching the floor. The mistress is just pushing rings through her nipples. Her cit (hood) has aleady been ringed. The Mistress steps back to admire her work and pulls the nipple rings taut, saying "My, don;t you look pretty". The 2 Dommes tehn work on her, sucking her, whipping / cropping her etc.

Next scene -
2 males stud slaves, naked, are ordered to release the slavegirl from her bondage and are supervised by the 2 Dommes as they fuck the slavegirl in all 3 holes repeatedly. One stud has short dark hair and a (slightly gay) moustache. The other is leaner, and has long hair, i think held back in a ponytail (yeuch!) Both are standard male porn stars: i.e. hung!

Final scene:
slavegirl is again in spreader bar, now in strappado position, bent over, the mistress reaming out her cunt from behind with a huge strap on dildo whilst the slave gril is ordered to clean the males cocks with her mouth.

Very horny, i think.

Any ideas what the title is?