From an old classic Harmony video circa 1987 "Ticklish Interrogation", Linda Knight cool and deatched, working on interrogating Olivia Chase (AKA Julie Winchester) - who is NOT handling it well!
A guy named Marni Rose form Oregon (I think) would sell be mail order still photos -oriented to tickle fetish and using whatever talent he had locally. Seemed to be clearly amateur models including some who were on the mature side - regrets I dont have any available.
Do not know where you'd locate it, but this was part of a large collection by a fellow (was on clips4sale?) into wet and messy/pie in face fetish primarily though about half his videos included some foot tickling - in the first pic, you can see the pies on shelf in background.
Am friends with a failry well known fetish model from the late 80s/90s; its not common but is happens. Was driving form Oregon to California on deserted highway and had car kept pulling up on her, guy signalled her to roll down window and asked "Hey, are you _______?" - she laughed and said...
This is absolutely brilliant. The art, the writing, the way it captures the period and the presentation as a scientific study. Loved the barely glee of the female ticklers as they carry out their "research".