Good question! I'm an older member too, who has lived the arc from magazines to VHS to internet clips. I would describe my evolution in taste as slight, more honed than changed. With the ready availability of so many clips now, plus me finally getting real life fun after decades of only dreaming, it's easy to see a pretty girl laughing, and that will always turn me on. But my favorites now are increasingly about intensity -- in a positive way; I hate pain or anything that looks like suffering. Tickling should be fun!
So when it is and the lee is REALLY ticklish (and/or turned on), I need the ler to make her go absolutely crazy. The more the better! When she does and you can tell she loves it too, perfect. And in the super rare cases where the lee is screaming (again, fun screams not bad) and actually asks for MORE, wow!!