I have a very specific one with toes. Like, really, really specific. Not “flexible” as in “bendable”, but as in “the ability to control your toes in strange, unique ways.”
While I have fapped to women, my thing is mostly men with long, flexible toes.
I do have some other less-specific ones, but at least there is new content popping up every now and then. But the toe thing? NOPE, super duper rare.