Helps to define what in the business means? Videos? Session work? That said, I don't think anyone beats Julie Winchester. After a roughly 3 year career in traditional porn, she did her first tickling fetish video under the name "Olivia Chase" in 1987. She then worked under that name and her porn name "Gina Carrera" for all the producers of the 80s/90s - HOM, Harmony, Cal-Star, Platinum ... she segued to mostly topless wrestling in late 90s but still included tickling scenes. Did a vid for FMC in the 2000s and 3-4 years ago did a number of vids for TickleVegas. She still does session work 30 years after her debut. Thirty years! I don't think anyone is topping that.