I dated a girl for about 8 months who wasn't ticklish at all but found out, through my fetish, that she was really into bondage and teasing. That worked for a while - for me - but we both knew there was something missing and I was never really satisfied with our sex life. This caused her a lot of emotional stress, and I felt terrible about it. It got to the point where she suggested I'd be better off with her roommate, who was one of those people everyone knows is ticklish and was tickled often...kinda like a running joke in her group of friends. We had conversations about including a third person but that was just talk and I knew it was just talk. The level of maturity that requires is rarely found in people in their early twenties.
The point I guess I'm trying to make, is that compatibility in the bedroom is important and can cause problems emotionally. When one partner doesn't feel as though they are able to satisfy the other, there is resentment. However, in my experience anyway, being honest about my fetish and having partners who were willing to indulge me resulted in a kind of sexual exploration they might not have had otherwise. More than once I've been with someone who had never experimented with bondage or anything else considered kinky, and in every case, it was a positive experience for both of us. Sometimes, once trust has been established, and if you take it slow and don't come across as a drooling, red-eyed lunatic, you can open doors that might not have been opened otherwise.
In my case we just weren't as compatible as I needed us to be, and it didn't work, but I do believe there could be a situation where two people might not be 100% on the same page with tickling, but have enough in common, sexually, to make it work.
