Sorry, late to this thread. I won't go into much detail but I have dabbled in this before.
So without any further details, here are my top 7 choices.
1. Ashley Madison
Ashley Madison has a lot of hot wives and regular wives, since it's the most popular married dating site of them all. Something like 75 million people or more, and the most important element is discretion and anonymity. Photo editing software onsite, verified profiles, and other goodies that make your adventure safe.
2. Victoria Milan
Similar to Ashley Madison, but with a different pricing structure (pay per month not in credits) and with extras like virtual gifts. Smaller membership overall, but more members that actually converse, I've found.
3. SwingLifeStyle
One of the largest swinger communities in the world, and "real swingers," not just a bunch of models or bots. The site has swinger chat, pictures, chat rooms, groups, clubs, stories, articles, and parties that you can attend in person to get to know your local swinger community. Hot wives are not exactly swingers, but a sort of offshoot or sect of the swinger lifestyle.
4. SDC
SDC is similar, but maybe not as big as SwingLifesStyle (SLS) but with many of the same features. Local matches, parties, and clubs, meet people traveling to your city, speed dating events, and plenty of articles and guides for first-timers to learn to etiquette. There are also listings of lifestyle friendly businesses. This is not a thing until you try to shop at places that don't understand hahah! That includes everything from BNBs, travel accommodations, and much more.
5. Swapfinder
A more basic swinging and hotwife site, with the ability to find local matches, chat in chatrooms or forums, and just find a partner fast without as much commitment to meeting scores of people.
6. PURE
In my opinion, PURE is even better for hotwives because it's not a big community, or anything like that. It's very much like a personal ad where you just come out and say what you're looking for for one night.
The messages and the ads even disappear after a short time, great for keeping things on the lowdown.
7. Adult Friend Finder
This site used to be higher and it still works...it's just a bit crowded by dudes and by women and couples who never get back to you. Still, forums, chat rooms, blogs and social media posts with nudes, how can you go wrong? Pretty big swinger and hotwife couples population here too.
Anyone else have different success elsewhere?