My wife and I were in France in our motorhome. We had been using lots of Aires, but also some wild camping. We had been to a nice beach a few years back and thought we might spend the day there. It was about a three hours drive, but it was worth it. We parked and was just a very short walk to the beach. There was very few people about, and we had times where we were the only ones on the beach. I had noticed that during certain time of the year it was permitted to stay overnight. I went back to the motorhome and set it up for the night while Marilyn stayed on the beach soaking up the sun. I noticed that we were not alone as another motorhome was also being set up. It was a young couple just a little younger than us. I returned to Marilyn for the last few hours of sun. As the sun started to sink young people started to arrive. They were setting up on the beach with their blankets and they were building a fire. There was loads of booze flowing and someone had a player and music was blasting out. There was people dancing, singing and playing ball. The young couple from the other motorhome had joined them. One young lady came over and invited us to join them. She suddenly discovered that we were English with limited skills in speaking French. She still dragged us over the their group and I was encouraged to play football with some of the lads. Later I discovered that I couldn't see Marilyn and thought she had returned to the motorhome. One of the girls seemed to have taken a shine to me. I will admit that I had been unfaithful quiet a number of times since we married six years back and here was another opportunity being pushed in my direction. The young girl grabbed a blanket and me and pulled me up into the dunes. I could hear other couples making out and one particular noisy girl groaning and yelping her pleasure for all to hear. I was soon down to things with the girl, who's name I never got. I was sucking her pussy as she sucked my cock. It wasn't too much later before I was on top and pounding her sweet pussy. After I came I wandered with the girl back onto the beach. I still couldn't see Marilyn. I collected up our stuff and made my way back to the motorhome. I was surprised that Marilyn wasn't there either. I dropped off our stuff and wandered back to the beach and looked again. I still couldn't see Marilyn, so I decided to make my way back to the motorhome via the dunes. Surely Marilyn wasn't in the dunes. as I entered the dunes I saw a guy really giving it to some chubby girl who was naked. Then I heard that noisy woman again. I headed in that direction wondering if Marilyn was watching them. As I entered the clearing I was stopped dead as I heard the woman shout, "Yes." That was no woman it was my wife. She was beneath a skinny lad that was plowing in and out of her pussy at break neck speed just before he dumped his load in Marilyn's pussy. As she lay there and the skinny lad moved away another lad moved between Marilyn's legs and slammed straight in up to his balls. Marilyn again yelled, "yes," and then she was off again moaning and groaning as the lad fucked her hard. This was the first time to my knowledge that Marilyn had cheated on me and not with just the one man. The more I watched the harder my cock got. Although there were others watching when the lad fucking Marilyn came in her, I was quickly helping her up and taking her back to our motorhome. Within seconds of getting her in the motorhome, I had her on her back on the bed and fucking her well used cum soaked pussy. I had never heard Marilyn be that noisy when I fucked her, but she was tonight. Afterwards as we lay there I asked what brought her to fucking the two lads. Her answer shook me, "What do you mean two? I think it was five of them that fucked me, but it became a blur." My cock was hard again and we were soon fucking again. No wonder her pussy was so wet and sloppy. The next day we had intended to move on, but we were both tired from the previous night so decided to stay another night. Later in the morning when the occupants from the other motorhome emerged Marilyn whispered to me that the man was one of her conquests from the night before. She also whispered that he was very good. Later in the morning Marilyn and I took our chairs down on the beach. The other couple joined us a little later. In our limited conversation we gathered that there was another party that night. I saw Marilyn's eyes light up. It was a glorious day and we swam and bathed nearly all day only breaking away to return to our motorhome for food. Then the light started to fade and the people started to arrive. Another bonfire was built and music was soon blasting out again. I found myself sat with the girl from the other motorhome and a very pretty girl I hadn't seen before. I asked them to come with me and we headed for my motorhome. It was the best three way sex I had ever had. The girls were playing with each other long after I was done. When they had finished I went back to the beach and the pretty one followed me, leaving our neighbor in our bed. I couldn't see Marilyn on the beach and suspected after the previous nights antics she was perhaps in the dunes. As I worked my way through the dunes I watched several twosomes, threesomes and even a couple of moresomes, but none of them were Marilyn. I made my way back to my motorhome and as I was just about to open the door I heard Marilyn yell, "Yes fuck me harder." she was in the other motorhome getting another good fucking from the sound of things. I walked across and opened the door. I could hear her, but couldn't see her as there was at lest three men in the way. I couldn't complain at Marilyn fucking other guys as I had already fucked two girls in our motorhome. As I shut the door and walked towards our motorhome I was joined by another girl who took my hand and went with me. Our neighbor was still in our bed and we joined her. She was soon joining in with us and I again had a great threesome and took turns with both of them. Then totally whacked I lay watching them play for a while. I woke with the sun in my eyes and as I squinted I saw that I still had two visitors in my bed. As I moved, the two of them also woke. The neighbor started to kiss me as the other girl dressed and left. I made good use of my morning stiffy and after a rest we both went to her motorhome. Marilyn was laying between two men. One was the owner of the motorhome and I had no idea who the other one was. The lads were stroking and fingering Marilyn as she lay cooing at their fingers playing with her. Marilyn saw me and said, "Morning dear, I'll be back shortly," as she wanked two hard cocks. The owners wife and I returned to my motorhome where we sucked and fucked each other again. As we lay resting I saw one of the men leave the other van and jump in his car and drive away. The girl with me and I left my motorhome as Marilyn and the girls husband also emerged and we swapped back wives. I was far to knackered to want sex that day and early evening we had to leave as we needed to get back to the ferry to go home. On the drive Marilyn slept and when we got into the port she woke. As we sat waiting we talked about what had happened. I told Marilyn that I had slept with three women that night and morning. Marilyn looked sheepish when she confessed that she lost count at six, but there was definitely more than that. I asked about when we get home and Marilyn was adamant that when we were home we would not cheat on each other, swap or anything else for that matter. Then after a long pause she said, "but holidays are different." Sadly that was two years ago and we haven't had the chance to get away since. Here's hoping.