We've been together for three years now and I'm as sure as I'll ever be that this girl is the one, for a million reasons that have nothing to do with my lifelong love for tickling. I do tickle her goofing around, during foreplay and even during sex sometimes but I'd be too afraid that it would cross her line into weird to tell her that I have a fetish for it. It wouldn't break us up, but if I ask her if I can tie her up and tickle her and she says no then I'm just thinking where does the sex and stuff go from there, is it ruined? I'd probably be too afraid to ever tickle her again. Then I'd be mad because I get to do it often enough to make me quite satisfied. I'm not sure I'm gonna go through with one of the other options either, but I'm really starting to feel the need to "scratch the itch" if that makes any sense.
First I will address matter of thread. Strip clubs; it really depends on the club. The ones that allow some touching, and have private rooms, etc you might be able to swing it. But as others have stated, you may have to pay more, and you will definitely be paying promptly. Some more private clubs are cool with fetish activity in their VIP rooms, and even have dungeons. The only way of knowing is asking the girl when you're in there. As far as pricing, that varies on club.
Now to the more pressing matter. If you've been with her for three years and have been tickling her so much, she probably already knows. And if not, then you telling her will 99.9% prompt a response of "Yeah, I figured as much. Its ok, I don't mind it." and she may even say "I kind of like it." As my girlfriend has said, "It turns you on, and that turns Me on. And plus, why would I not like something that makes me laugh?!" (love that girl) I don't think you have anything to fear except that which will continue to linger if you don't tell her.
And one last bit of free advice, maybe more important than that just stated. And piggybacking what Jagermeistered said...
...and the past will always bite you in the ass somehow(you will feel like shit, or she will find out - or, all the above)...
I've always thought of myself as an honorable, noble man who values virtues and morals. I love my girlfriend and I too think she is the one, yet I have experimented and experienced paying to tickle others, for the reason of getting it out of my system now as to kill the desire so it doesn't strike down the road. The desire to slake my lust of experiencing others while I am still young and virile; lust found only with tickling and not sex, but regardless, the presence of another woman. I have strayed from my true nature and beliefs and given way to my darker demons. And it is a weight heavy enough to break my back. For your woman's sake and for your own, boy, I strongly urge you to resist paying others for what you could have with her. And not only does it come free with her, but it comes with a bonus, it comes with love, which is more desirable than the services any courtesan or stripper could offer.
That is my advice to you, you may do with it as you wish.
J

J