The latter, but if they secretly knew what they were doing and I didn't, then either choice would be the same, wouldn't it? If they were keeping it secret, but I knew what they were doing, that'd be hot and I'd play along and pretend like it didn't effect me, only to ask for it to stop in a minute or so. I love seeing how long I can fight it.
cool question! i say the second. this is because part of my love of being tickled by women is having them want to drive me crazy by doing it, having them know how it affects me and still do it.
i would have said 2 my entire life because i never told anybody and them knowing scared me - but my new gf knows and loves it and knowing she has every idea what she is doing to me, and wants to be doing it to me is pretty freaking cool.