Man, that would be hard to pass up. I would guess the chance that your wife would be into some fisting and anal would be about....el zippo. Shit man, could you give her a dirty sanchez for me?
Dude, not helping. I'm having some serious fantasies about going to visit this girl ans slipping my rock hard, lubed up cock into her ass.
Well, then you must weigh the pros and cons, decide what is more important, your marriage or sticking your cock up some chick's ass.
You can always get a new wife if the bitch leaves you. P.S. - Clean under your finger nails after fisting her ass - that's how I got caught.
You took vows. Hope a 1 time experiment would be worth that. Talk to your wife, maybe you could start slow, and even surprise her with some amazing sex.