check with Hammmer he knows everyone
no i don't think he can help.
The truth is, what you are looking for is very hard to find. Especially out in the KW area.
With the swinger thing you tend to have to also deal with the "wife" which is not what you want. Sometimes there are men advertising or answering the various swingers ads but they are just everyday men who want to fuck your wife. or you can try the local CL. but they aren't "pro's". I assume you are looking for someone buff and hung?
From my experience, most of the above are average guys who can't always perform when all of a sudden the husband is involved.
there is a guy who has a little agency in toronto that could probably help out and you can try one of the male strip joints in the GTA.
Those guys are usually very comfortable with the MMF thing and i know for a fact its a very common request they are used to dealing with.
you can pm me if you want contact info on the T.O. thing
good luck