As the wife, hubby first told me about being bi shortly after we started dating. I always fantasized about watching two guys going at it, and I mentioned this to him somewhat in passing, and he gave me a devilish smile and asked, "oh, really??" and told me he had had some experiences himself.

We found our first guy shortly after that. We posted on craigslist when they still had their casual encounters section, and went through about 300 responses together (and about 100 dick pics!) until we found someone we both liked.

I didn't know how I'd actually like an MMF, so our original plan was that I would just watch. It started out with me giving directions ("put your hand on his thigh. Rub his cock through his pants. Now unzip them and pull it out" and things like that), but I only made it about 5 minutes before I ended up joining. And I'm so glad I did, because MMFs have become a regular part of our sex life, and I wouldn't trade it for anything!

So, in short, what you need is: good communication, open-mindedness, and maybe a little sense of adventure. 😉