It's tree bark, not ground up glass and sandpaper ;) She might get a little friction burn, but she's just so happy to be in a world that has trees that she doesn't mind in the least.
Must be one of those fancy smooth trees. I don't know, man, I'll take your word for it, but the trees around here would kill you just as soon as look at you if you happened to bump into them.
I grew up around palm trees and, later, was raised literally in the middle of a forest. Trust me when I say that trees, whilst not comfortable to have sex against, won't do you any harm ;)
