My wife and I have spent nearly all of our 37 years of marriage dealing with this fantasy. She and I have never slept with anyone else, but have a passionate and imaginative lovemaking history. It probably started when, in the 70's, we began to explore the burgeoning pornography industry. Since my wife is so open-minded, she seemed pretty turned on by finally seeing other cocks for the first time. (If I am to believe her...and I do...mine is the only one she's ever seen "in person.") Their size, shape, color (she likes them dark, even more than huge...great for me, since my genitalia are of slightly less than average size, but are nice and brown), ball sac, veins, etc. seemed to appeal to her sense of voyeurism and mine too. Because we're so confident in each other's desire for fidelity, we've found it extremely erotic to talk about big cocks and her reaction to them. We even talk realistically about her enjoying another man's dick while I also participate - with her, not with him. We've also discussed in fantasy terms her sucking on another woman's pussy. Just yesterday we had a session during which, after become heated up looking at a hot black/white porn flick, she put on quite a show with a realistic looking fake black cock(sucking and licking it in a very realistic frenzy) and then got off while I plunged it into her pussy. After all these years, these fantasies are still strong, but will never become reality. However, it's all so exciting that our sex life is still very fresh and, for me (and her too, I trust), every time is more enjoyable than the last. It really just keeps getting better and better. I attribute this to our liberal attitude toward "talking about" our mutual fantasy. We've even woven in talk about some of our well-endowed friends, whom I've described to her. That never fails to get her off...sometimes just the mention of an acquaintance's name and his big cock, while my wife is on the verge, will give her a shattering orgasm. It may not be for everyone, but it's worked for us for years and will continue to, I'm sure. The key ingredients are a mutual love of voyeurism, complete love and trust in each other, and a liberal and imaginative lovemaking mindset. These admittedly are hard to find and I consider us lucky and rare to have enjoyed this for so long . I think I'll go fuck her now!