This is just something I've pondered and contemplated, not a personal quandry. I have the luxury of a job where I am not forced to interact much, but tend to overhear a lot. People, mostly women, talking about going along with something (not tickling specifically: could be sporting event or concert, type of food, show on TV) simply because their partner did. Made me think of my own interactions. I can think of girls I knew in college who would get involved in things to please a guy. Back in my dating days, I remember a girl who discovered having her very ticklish feet played with was a huge turn-on, never discovered until then because all she had considered before was that her feet were super ticklish. Have known women that "loved" a certain music pretty much just cause the guy they liked did.
Now, I'm not the personality type that confirms. Ever. So it is a fascination social study for me. And it got me thinking that, in this particular fetish, there are likely some who 1) just go along to please someone else, 2) got into it because someone else exposed them to it, and 3) those who truly have a self-sustaining tickling fetish.
I loathe someone submitting to so thing they don't like just to "please" someone else. But statistically speaking, there must be a certain percentage here that are so because of a sense of "duty".