I think this is a French film, actually, best known as "Charmes secrets de Miss Todd" (The Charming Secrets of Miss Todd)and released on Video Marc Dorcel in 1988. The only American pornstress in the cast is Tracey Adams, the woman in the movie theater scene. Everyone else is Euro, including director Michel Barny. I can't ID all the femmes, but the older woman in the office scene (brunette) is likely Caroline (Carole) Laurie and the older woman in the slinky silver dress is Laura Valerie. What's posted here is a German version with the title: "Sexual Secrets: In a Sexual Frenzy." Wish it had a cast list -- would love to know the name of the blonde who gets boned in the last scene.
nice upload tho :)