Threesome

My boyfriend and I have sex on a daily basis. It's always hot and heavy. We are both extremely attracted to one another. Last night we were told that a very attractive girl whom neither of us know any more about other than her name would like to join in. He likes the thought of it, and I honestly do too. I love new experiences. I just don't want it to hurt our relationship. Should I let this happen or ignore the offer for the sake of my relationship?