It's the old, old rule of swinging. Communication.
All or most swinging couples got into the lifestyle in different ways and each has a story to tell of how it all began. Mostly by suggestion by one or other partner. At least you are communicating with her. Your approach however, may have been a little too much to the point. Maybe you should subtly ask her if she has had any fantasies about experimenting with a bi woman. Discuss fantasies, likes and dislikes. You realise your wish.
If you scroll back under the Forums *everything goes*and look up a few forums written by Joesoap4U , round about June this year,he talks a lot about how to introduce your spouse and the subject on swinging.
sorry, the wrong profile , although he posted some really good info..and geve the best answer to the question.
look up *hardus* forum written in March.
End of the day, and you are having some nightcaps, both feeling mellow, then just start chatting about your and her fantasies
Unless of course she is absolutely against this
Most women are apposed because they feel you want this to get into other woman and it takes some convincing that you will still feel the same about her after the fact
Make sure you know the reasons you are wanting this
Guys I can promise you that patience will be rewarded and once you have her trust, and of course she has yours, thier will be years of good fun ahead.
It is amazing how something like this can increase your love , and lust, for each other