A group that is relatively closed is the best way to go. In the group that i am in I have a nice variety of partners, they have a nice selection of bulls. We all know each other to varying degrees. STD's aren't a major concern, we all get checked a couple of times a years. If one of the women would like to pull a train there are always more than enough bulls available to fulfill any woman's needs. If I would like a woman or two to spend a few hours with it is easily arranged. You seem to be building toward that. May your bulls and your orgasms be many!
I always enjoy reading your posts Torpedo... Your comments and ideas are very similar to mine,.. Even your group has ver similarities to our small group of very close friends.. So, thanks for all your comments..