I walked indoors to find my wife sucking someones cock. It was her third in as many days. I know we have an open relationship, but this was getting beyond a reasonable level. After she had swallowed his cum, he quickly left. I sat Joan down and asked what the hell was happening. She told me that she couldn't help it, she had a yearning that she was unable to suppress or satisfy. She agreed it was becoming unreasonable, but couldn't help it. We had been in the swinging scene for almost two years and she had been pretty aggressive seeking men out for swaps and then at parties she would take on two or three men. But this was taking things to a whole new level. I asked her what was happening. She told me that she had this insatiable itch and longing for cock. I asked if a trip to the doctors or other professional people could help. She said she didn't think so, but would try anything if I wanted her to. A week later the doctor arranged a visit to a psychiatrist. Joan wasn't happy, but we went to the appointment. She had two sessions with him and he suggested a visit to a hypnotist and made the arrangements to get to the bottom of it. All it achieved was Joan getting to his bottom and sucking him off. After the next session he spoke with me and said she had again sucked his cock and his best advice was to get her lots more cocks and see if that satisfied her lust. I found a dogging site on line and decided that was the best way to get more cocks. On the evening I suggested she dressed sexily and in something she didn't mind getting dirty in and on. She didn't know where I was taking her but knew it was probably good fun. On arriving there was just one car with two men sat in it. I parked opposite and flashed my lights and wound our windows down. They were around the car in seconds. Cocks in hand and very shortly in Joan's mouth. One was quite large and he forced it hard into her mouth and throat. Joan groaned and gagged just a little. It didn't stop her sucking both cocks to completion and swallowing their offerings. Before Joan had finished them off two more cars arrived with three more men. One of the new men suggested that she should get out the car and kneel to make it easier for them. She quickly obliged and knelt on a cushion one of them supplied. As Joan sucked her first of the new cocks one of the other men was fingering Joan's pussy. She was moaning around the cock in her mouth. He came fairly quickly and the next man laid a blanket on the floor and laid on it for Joan to lean over and suck his cock. The man fingering her fanny took his opportunity and pulling her dress up and her panties to one side slid his cock straight up my wife's pussy. Joan wasn't expecting it and squealed loudly as she dropped the cock in her mouth and jumped a little. Then she went back to sucking the cock with a renewed vigor. More cars were arriving and she now had six men stood around her wanking their cocks waiting fora turn. The guy being sucked came and was quickly replaced. Then the man fucking her also came and was replaced. Joan was thrusting back at the cock in her pussy. He came quickly and was again replaced. That night Joan went through probably twenty men. Some she sucked some she fucked and some she sucked and fucked. When we eventually got home she was complaining that her jaw and pussy were sore and went straight to bed still covered in spunk. There was a swingers party the following weekend and to my surprise Joan was happy to go to it, but stated that she did not want another gang bang or more than two men. At the party she picked out two men and went off with them to a separate room. I hooked up with a woman and we were in the adjacent room. I could hear Joan being fucked as I fucked Rhona the woman I had picked up. After we finished I was laid cuddling up with Rhona and I heard her still getting fucked. Then all went quiet in their room. After a while I put on some pants and went to find her. She was still in bed with one of the two original men cuddled up. She saw me and asked if I was ready to go home. I told her I was if she was. She said she was and got out of bed and dressed. On the way home I told her of another party the following week. I was shocked when she told me that she wasn't fussed to go. Since then, we have over the last few years only attended two more parties and swapped a half a dozen times. It would appear that the dogging got it out of Joan's system. She still enjoys sex, but has got over her insatiable need for cock all the time.