How to find a woman who is into both of us...

I have been very happy with my boyfriend, we’ve been open and honest and its gotten us very far. We are very close and have an awesome thing going. I am not a lesbian but I do like to bring other women into our sexual relationship every now and then. It has not been a problem at all and was my idea to begin with. I was wondering if there was a good way to find these women, I have been having a hard time finding the right woman, and if there is a good way to approach a woman about this…