My first gangbang happened several years ago. My husband and I had been swinging for a year and had successfully nurtured a small group of swinger friends. At that point, it was three couples other that we had successfully swapped with at that point. Two of the couples were already friends who regularly swapped and the third couple was a close friend of ours who started their lifestyle with us.
The two couples who were friends with each other were excited when they became friends with us because they talked about being able to explore something that neither of them had done before: a foursome (three guys one girl or three girls one guy). I took it up a notch and introduced our close friends and thus our mini swinger friend group was born (four couples at the time).
After a few game nights and meet ups, everyone started feeling comfortable around each other, and one night we discussed how each couple had a chance to swap with the other three couples and got that first nervous fuck out of the way. Now we can discuss the logistics of the gangbangs.