Can you get it back?

I've had a similar experience. My W went crazy with about 5 guys for 2 months, then quit cold turkey. I am working on getting her back into it, but the key is to make it seem like it is her idea, not yours.
I would encourage (very subtly) her to flash your friends, go out with her girlfriends etc and see where it goes. You probably can't power her, but let her get there by herself.

I cannot explain it, but it seems to be a female thing...it becomes what I term a 'seamisteral thing'....for a while she is a very hot wife, wanting to fuck whomever turns her on, and then suddenly she stops cold and says stuff like "this is getting out of hand, and we need to stop"....she then gets totally cold to the idea of fucking other men for some months....then I have to start working on her all over again until suddently it may be the 'hot seamister' again and she is suddenly again willing to fuck other guys.

I guess this is why we will never figure females out...with me it is on ALL THE DAM TIME! I want nothing more than to see her fucking bulls and enjoying it!! But because of her on again-off again attitude I have to wait until SHE is the one who is ready and receptive to the idea...life ain't fair!! I suppose I should just consider myself lucky that she has good seamisters, as some poor blokes never can convince their wives to try anything wild at all!! I guess a half full cup is better than an empty cup!!