We are Robbie and Joan ,married and in our 40's. We have been very friendly with our neighbours Tony and Gail for about 15 years. They are a bit older than us in their early 50's. We have dinner together once a month and whilst we have been friendly it has only been platonic. Two weeks ago Joan and Gail went shopping and while they were in the car there was a radio programme about wife swapping.Joan made a flippant comment and then noticed that Gail had gone bright red. Joan then learned that Tony and Gail and been swingers for some time. Joan told me later that she had got quite excited during their conversation and has asked Gail whether she fancied me. Gail confessed that she and Tony had fantasied about swinging with us. Later Joan asked me whether I would like to experiment and I said without hesitation that I would. I phoned Tony to make sure he was on board and he said he could not wait. He told me that their experience was that the ladies must decide how things should be arranged and that the guys must just follow the lead. The next night we went to them for drinks. As the front door opened they were both standing wearing only their dressing gowns . Joan put her arms around Tony's neck and they were immediatley kissing deeply , I saw Joan's hand move to Tony's stiff cock. Gail slipped off her gown and started kissing me, soon our clothes were on the floor and we went upstairs to the bedroom. In no time we were all having robust missionary position sex ,from time to time as we both pumped away Tony's thigh and mine would touch and that turned us on even more. It did not take long for everyone to cum. As we relaxed there was alot of stroking , at first I was shocked that Tony was stroking me and Gail was stroking Joan. But pretty soon the juices were flowing and this time it was side by side 69's, Tony and I together and Gail/joan together. A first bi experience for us. It was a wonderful night that has totally reinvigorated our sexlife. Tony and Gail told us that another couple we know also swing and last night we entertained them as well.This time the ladies decided on threesomes, with the evening finishing with the three guys together and the three girls together. The slurping noises were an amazing turn on. We are getting together next week and the girls have decided on a dark room format. I am permanently erect at the thought