How to go about this
There have been so many cultural changes that stand out so prominantly these days as different from when I was young and single. Knowing what I know today, if still unattached, and if my co-worker is also unattached, I think I'd go for it, although it would not be with tickle discussions at work. I'd suggest, possibly dinner and a movie and find out how things are during the night. I still can't say the word "tickle" in public conversations. The other thing is you have to be so careful these days. It's so easy to do or say something that can end up with you on unemployment, although you can likely keep testing the waters as you proceed to avoid such a bad end.
Back in those days, dating co-workers made for an interesting dance, although I did it a few times, and did indeed find out about the realtive ticklishness of the young ladies. (All the ones I dated were ticklish.) I found myself deliberately applying the brakes to make sure nothing became too warm. I always thought there were too many land mines involved in dating the person you see at work each day.
Several years ago I had a woman working for me that was about 15 years younger. Looking back on it, I can easily see how that relationship could have spun out of control (it didn't). She was outside my door and heard me talking to my wife on the phone. She heard me say I was going to seriously tickle my wife that night. She came into my office and gave me such a look. When I found out why, that was embarrassing.
Then she let me know that she and her husband were deep into tickling with her as ticklee. I remember thinking to myself, "Down, Boy! Sit! Stay! Gasp! Gasp!). At least once a week for the couple of months or so she regaled me with what her husband did to her last night. I think she might have even sensed how these stories were affecting me and was enjoying that as much as the stories. Here is where things could have easily got WAY out of hand.
She suggested one day that we should both come in next Saturday. She could do some work that I could check. If she made any mistakes I could correct her by putting her across my desk and tickling her. (Down, Boy! Sit! Stay!) I laughed it off, although I know she was completely serious in her suggestion. I told her that sounded like a textbook case of harrassment. Wow. Dodged a bullet that time. If we were both unattached, I think it would have been impossible for me to walk away from such an invitation.
Yes, knowing what I know today, depending on your situation, I'd go for it. My only thing is completely personal. Mayby this is always the case for someone that finds tickling so much a turn on. I just find it most fun if part of a complete relationship. If I ever had to get to know a woman again, really get to know her, tickling would have to be part of it. Still, I would want to discover other mutual interests. I'd love to sit around and talk tickling, and talk about our experiences growing up, talk about religion and politics and favorite authors and how we both felt about kids. Oh, and I'd like it if she liked historical museums and remembrances, ball games, bowling and movies. No matter how you slice it, though, you have to start somewhere.