Can I Tickle My Robot?

Don't worry, this isn't some kind of double entendre or cheap joke. It's a legitimate question.

Some robots do like to be tickled. Like these guys. Especially the first one - look how much he is enjoying that boy tickling him...

This guy on the other hand, doesn't strike me as the kind of robot who would enjoy being tickled:

And I sure as hell wouldn't try to tickle this one: