My first thought (also) is:
Does your wife participate with you on this BBS?
There is a wealth of information and expereince here, and it could be a really fun thing to do, and learn, together.
Lots of good suggestions here, especially the "Meet & Greet" attendance. That is a very popular way to connect with like-minded folks, and get clarification on questions y'all may have. Just be sure to do what you need to do (whatever that may be), to assure her that the event will be "no pressure".
As for your question about your wife getting wet associated with role-play... I'd be inclined to answer: "Yes".... However: I agree with the tread lightly ("baby steps") approach. Being pushy and aggressive seldom gets you a desirable result.
About 8 years ago I was trying to get my partner to warm-up to my favorite kink: V&E (voyeurism & exhibitionism). We were on cam on AFF (which can be a bit of a zoo), naked in bed, just chatting with some of the watchers, and lightly fondling each other occasionally. Folks were being civil, and politely encouraging & complimentary, especially of her. (It took months BTW, to get her to agree to do even that. We always kept our faces hidden.) She was being (typically) quiet, and a bit shy. I was doing most of the chatting. Something prompted me at one point to feel how wet she was, and much to my surprise she was completely soaked. After a quick whispered exchange we turned off the cam and had one of the best play sessions we'd had up to that point. This was definitely a turning-point event. She soon afterward (matter of weeks) became a very willing participant, putting on live sex shows on cam, and even getting creative about it, making suggestions, etc. She really got into it, which was a very substantial turnabout from her attitude when we started.
The main point to the story is that, as mentioned, everyone is not necessarily wired the same way, but sometimes it takes the right trigger for someone to come out of their shell, if that is where they are inclined to go, but don't know it yet.
As has been suggested already, be patient and keep your relationship first. The fact that she will even discuss these things is a good indicator. And always be sure to move no faster than the speed of the slowest person involved.