Great that you have a group Of mature couples like this. I have been involved as a B/F in a similar group of 50 to 75 aged couples where some couples bought more than 1 B/F. This would usually give a ratio of about 1.5 to 2 for each wife. All of the hubby's were or got into helping and learnt to fluff, guide cocks into place, clean up cocks and pussy and being feed from pussy. Those that didnt initially soon learnt and followed others and got a lot of encouragement. The wives worked out who they wanted to fuck and also who was going to help/clean them (usually not hubby) and all the wives were very turned on seeing their girlfriends fucked and then seeing them being cleaned and the B/F's cock being cleaned and having the last of his semen sucked out. Wives rated husbands on their effort and at the end of the night the best performers were rewarded with a release. Every hubby got to consume a lot of semen/pussy juices and some finished the evening drinking golden champagne from well fucked pussy's.
Just wondering if your parties are similar.