70's loop with long haired blonde

[dar99]

This is gonna be really vague, as that's all my memory has of it. But there was an old blurry 8-10 minute loop on the end of an old vhs i had once, there was no title but it was probably from between 1974-1978.

All i remember is two girls, one i think was brunette and the other was a young thing blonde with long straight hair. The older girl was seducing the younger blonde, she laid her down on a couch and there was a slow build up to her rubbing her pussy and going down on her, and i remember that she shoved four fingers in her pussy, nearly fisting her, which seemed extremely raunchy and taboo in those days. A guy eventually enters and fucks them both as well if i recall correctly. I think the younger blonde looked a bit like Lindsay Wagner (from the bionic woman tv series in the 70's). If this sounds familiar to anyone please toss up your ideas. This was one of the first xxx things i saw in my youth so it holds a certain spot in my wanking history.. i'd love to see it again.