There's absolutely nothing wrong with having a fetish, but it's a difficult subject to broach - especially if your (would-be) partner is comparatively vanilla. Sometimes a fetish makes people sexually/romantically incompatible, but you won't figure that out until it's brought up, and there's definitely a preferable time to do so. For example, divulging your fisting obsession over a first cup of coffee might be met with a...lukewarm response. Unless you've met another fisting enthusiast, in which case: lucky you! A match made in kink heaven.
Fisting comes up repeatedly in the latest Reddit thread EverybodyLikesCheese kicked off: 'Ladies, what's the weirdest fetish a guy has dropped on you all of a sudden with little to no warning? Were you with it or...against it?' Answers ranged from keeping his fleece on during (cozy!) to bestiality (...). So as not to be hypocritical, here's your warning upfront: NSFW.