Well the only way to do what you are wanting is to sit her down and talk about it. Having a threesome is a lifestyle that shouldn't be rushed into but talked and talked about. It is one thing to have it as a fantasy in your bedroom and a whole other thing to actually watch your wife have sex with another man. Make sure you
really want that first.
Also what is up with her using the dildos alone? You should be using it on her and doing some fun roleplaying in the bedroom. Trust me you won't regret it.
