Right, I forgot to specify duration... mine is 01:14:05
However, I can't find any version with a length superior than 01:18:00

So my guess is, that because of the hell and maze of french adult movies in this era and your other comment, there could be a chance we're talking of the other "Attention Fillettes".
This one is from 1981 and stars Marilyn Jess, and you can find details here: https://www.egafd.com/films/details.php/id/d00011

The other one is from 1987 and details are here: https://www.egafd.com/films/details.php/id/a00008

Do you think it could be the reason?