How do I broach the subject of adding in others with a Bi-sexual Partner?

Well, a great way to start is by talking about your pasts and then your fantasies. You need to talk about what you'd like to do and try. My boyfriend and I are both bisexual and we had a very frank conversation before our relationship was official about what we wanted sexually. I wanted to have some girl-girl time without him, and he wanted the same with men. Neither of us is comfortable sharing with another partner such as me sharing him with another female - maybe someday down the road, but right now it's not for us.

I say have a nice date, and when you're comfortable and relaxed then just tell him you're curious about what he is looking for and start telling him what you are looking for. Just say it - being honest and straightforward is the best!