You know how most dogs lick you on the cheek? If you're sleeping and not ready for it, my dog, Joe, will get his tongue inside your mouth. It's by far the worst kiss I've ever had.
For me and for I'm sure any actor, each role is a different challenge to prepare for in a different way.
I'm picking and choosing in terms of the stress factor. If it's not fun, I'm not going to do it.