The late great Tanya Roberts was best known for having starred on Charlie's Angels and That 70s Show--but I'll always fondly remember her from Sheena.
She also did this horror film, Tourist Trap, where she has a very nice scene.
Having been captured, along with her boyfriend (who's off-screen, here), by the film's central psycho, Roberts gets her wrists tied behind her back to a support beam.
Barefoot, she's clad in wonderfully tight shorts that expose her nice long legs.
She proceeds to reach for a discarded file on the floor with her bare foot, and then shoves it with her foot over to her boyfriend, who uses it to cut himself free.
The psycho in this movie is played by Chuck Connors, who was on the old The Rifleman TV series. There are two other damsels in this film, but Tanya's scene is my favorite, for obvious reasons.
Although her feet are never tied, this is still a very nice BF bondage flick.