This is where Security through Obscurity comes in handy. I wouldn't mind being tickled (at least briefly) by pretty much anybody who knows I exist (except my birth family, who wouldn't be interested anyway). However, most people can't tickle me intensely enough, and end up just wearing out my nerve endings and increasing my tolerance, which is bad. Therefore, I would have to request that the genie endow them with actual *skill* in tickling first.
Other than that, let's see, who would I want to tickle... Does the genie magically make them consent to it, too, or will I get lots of cute girls mad at me?