My wife and I have discussed this from time to time. We've come to the conclusion that we're not going to involve friends or acquaintances. Going to bars, internet, and what not doesn't appeal to us. So the last obvious place to go is a shall we say an adult resort. We're fairly certain that this would be a way to be discrete, and hopefully a safe environment. I don't think it'll happen at least any time soon, I've grown accustomed to being in a monogamous relationship with her. However, if the opportunity arises and she still feels she wants to try it I'll oblige.