Oh and about your situation dude. (And girls I'm sure this would all work the other way round if you're trying to get your man into it too, I just can't be arsed to type "him/her" a dozen times)
OK, This is roughly how I play it: Next time you're making out or having a cuddle (just make sure it's a nice intimate moment thats probably leading to sex), ask her what HER fetish is. If she says she hasn't got one tell her you've never met a girl who didn't have a fetish. She's bound to ask you what yours is at this point. Say "Why? are you feeling adventurous?" If she says "no" then cease all intimacy: Lights on, clothes on, lets watch a documentary about soil erosion.
But hopefully she says yes: Tell her to close her eyes and place her arms above her head and really gently start tickling her. Tell her to keep her eyes closed and not to move. I'd reccomend trying not to have a huge indulged grin on your face at this point either, but to look deadly serious (in a humorous kind of way) or just look appreciative and relaxed. (At this point, if she blurts out "You like tickling??" or something like that, SSHHH her and ignore it) Tell her she's doing well. Tell her you're going to make it worth her while. You want to try and make this at least a little bit of a game for her so you could say something like "the longer you last the more I'll make it worth it for you" or "you can move when you admit you have a fetish! or at least a kink" and then when you think she's made a good effort for you, make it worth her while. Give her the best orgasm you can.
Notes: It's best to try to approach this when your girl is all wet because she's wanting a certain favour off you at this point. If she denies you your pleasure, deny hers. Switch the lights on, clothes on, lets play chess. If you're derided, give her your opinions of exactly how you view her behaviour. Don't get angry because it'll show her that the experience has phased you. Just show your dissapointment and don't do anything that she wants. Why should you?? Well there you go, thats how I come at it. You'll get better at it the more you try.