In my particular case, not only is it the ticklish sensations (which, to me, are the second best in the whole wide world 😉 ), but it's a control issue.
Typically I am a person who runs the show -- regardless if it's my choice or not, generally I'm perceived to be a take-charge kind of person... but I don't necessarily always want to be.
I have few known chinks in my armor and, being maniacally ticklish, is one of them. Only a very select few people in my real life are even aware of it. Once the serious tickling starts, this Take-Charge Lady is almost instantly reduced to nothing more than a heap of Giggling/Writhing/Laughing/Smart Alec but Immediately Remorseful SchoolGirl.... weak as a kitten... I have no choice but to relinquish that ohhhh-sooo-sacred power... like a gift to my Tickler.
Ohhhh, you can bet your winning lottery ticket that a Tickler would have his work cut out for him to even get me in that type of *predicament* -- but once that corner is turned, I hope he's well rested 'cause this Ticklee is also insatiable 😀