In the ten years we had been married my wife Charlotte and I had not used contraception and much to our surprise she had never fallen pregnant. Now just over thirty my wife and I were wanting kids and started to worry about why she wasn't already pregnant. A few trips to the Doctors soon had the answer. I was firing blanks. We asked about IVF and was told that as I had no viable sperm at all it wasn't an option. We tried two attempts with sperm donors, but it was extremely expensive and we couldn't afford a third attempt. Charlotte was getting down and I told her I would do anything to help her. It was now that I suggested that she take a lover until she got pregnant. Charlotte said that she was worried that I wouldn't want her afterwards. Knowing who had impregnated her could tear us apart. Then I suggested that if she had a couple of lovers I wouldn't know who had knocked her up. She agreed that could work. We talked about the practicalities. Would I be with her and her lovers or would she want to be on her own. Charlotte was clear that I would have to be with her. Then the question was would she see the men separately or both together. It took Charlotte two days before she answered that. She said both together as it would feel less like cheating and just a one off. The next issue is where do you find two men that are prepared to fuck a thirty year old woman at the same time. I had seen magazines on the top shelf at the local shop and some looked as if they may be our answer. One was called Contact and I bought a copy. That night Charlotte and I sat reading the adds. I was astounded by how frank the adds were, but struggled with some of the abbreviations that they used. Charlotte was taken with the pictures of a couple that were into swinging and seeing separates. Charlotte suggested that if we saw them as a couple it wouldn't feel so much like cheating. I had to agree and the man's wife did look sexy. We answered their add along with adds of a few single men. It was about a week when all three replied with photos and phone numbers arrived. We rang the first single man. He seemed a right dick and thought he was gods gift to women and Charlotte couldn't get him off the phone quick enough. She almost called a halt to it there and then. The second man was called Ray and he was very easy to talk to and we explained that we wanted to get Charlotte pregnant. He was happy to oblige even when we said we wanted a couple of men to share Charlotte at the same time and asked if we had anyone lined up for the second man. We told him we hadn't and he said he would see what he could do and we arranged to talk again soon. Charlotte quite liked his photo. We rang the couple and they were also easy going and when we told them what our aims were they said they were happy to oblige and Harry said he had a mate that sometimes shared his wife Gail and he might help. Charlotte worked out when her most fertile time would be and we rang Harry and Gail and told them that the coming Sunday would be Charlotte's most fertile time and they agreed to come over to us on Sunday afternoon. They told us that Harry's mate was not available. We quickly called Ray and he also agreed to come to us. It was about one thirty when Ray arrived and to our surprise he had a mate in tow. Charlotte was very nervous and had spent ages getting herself ready. I was also nervous, but also excited at the thought of seeing Charlotte being fucked by not two but three men. Ray, Tommy and Harry when he arrived. To say that Charlotte was nervous was an understatement knowing that shortly three men would be fucking her. Then Harry arrived with his wife Gail. Harry had also brought a second man John. I had to break out the brandy for Charlotte as she was shaking knowing that not two or even three men were to have their way with her but now there was four men wanting her. After two good stiff brandies she was relaxed when Harry started the ball rolling and moved to Charlotte and started to kiss her. It seemed no time at all before Charlotte was naked and on the floor sucking cocks to get them hard. Gail joined her working to get the men ready. Then It started. Harry was behind Charlotte as she was in doggy position sucking two cocks. He was quickly banging away at my wife's unprotected pussy. All four men were hard and taking care of Charlotte, so Gail grabbed me and dragged me to our bedroom. Gail was a real sexy bundle of fun and I was soon making love to her. I was glad that Charlotte had suggested that I also had some fun. Afterwards we lay listening to Charlotte who was moaning and groaning as the men took turns with her. When we returned to the lounge Charlotte was on her back and John was plowing her pussy. Harry and Ray were sat with limp cocks and Tommy was still rock hard and waiting for his turn. Charlotte looked directly at me with a huge grin on her face as John plowed her hard and fast. As he came Tommy was quick to dive straight in and Charlotte was almost bent double as her legs were pinned almost to her chest and he started to plow Charlotte's pussy. Gail went over to Ray and suck his cock to get him hard again. Gail had him ready just in time as Tommy came. She moved to Harry to work on his cock as Ray went in for seconds. Seeing Gail on her hands and knees sucking her husband had me hard again and positioned myself behind Gail and took a second crack at her pussy while she sucked her husband. It was quite a while before Tommy came and Harry pulled away from Gail and went for his second turn at Charlotte's pussy. I also came and slumped on the sofa along with Gail as we watched Harry plowing Charlotte. Although John was hard again Charlotte called a halt to things saying she was getting too sore. Before they all left I made sure that I had all their numbers in case it hadn't worked and we had to do it again. Charlotte was sore for a few days, but very happy and even suggested that we met with Harry and Gail again just as a couple with another couple. Two weeks later we had a foursome with them. All four in one bed was cramped but fun, not knowing who was touching what as we made love. It wasn't long before Charlotte was over the moon as she had just done a test and found she was pregnant. During the pregnancy we met with Harry and Gail a few more times. Seeing a pregnant woman getting fucked has to be the biggest turn on I have ever had. I thoroughly enjoyed watching Harry fucking Charlotte as I fucked Gail in the spoon position. She was seven months by this time and seeing him fucking her with her huge belly was fantastic. Then the twins were born, and after Charlotte was able to have sex again she had little energy for it and devoted what energy she had to the twins. I must admit I did think about cheating with someone else, but I didn't. It was twenty two months later and the twins were doing fine and needing less of Charlotte's time and energy. Her libido was returning and our sex life was improving back to what we had before the twins. I asked Charlotte if she wanted any more children while she still could and she was quick to say yes. She told me that she had been worried to raise the issue with me. Having two kids already from one or two of the men that fucked her that day she was worried that I wouldn't want to bring up any more kids sired from other men. I told her the important thing was her and the twins happiness. We agreed that we would have one more and I was soon on the phone to the four men. Harry and Gail was thrilled that we were ready for another child and agreed to come along when we could arrange things. Harry informed me that John was now married and didn't play around anymore, but Gail's bull was probably available. Both Ray and Tommy were available and fortunately at short notice. We arranged for the twins to stay with my parents for the night and Ray, Tommy, Harry, Gail and Steve arrived. I was shocked Harry hadn't warned us that Gail's bull Steve was a huge black man. Charlotte was extremely excited and the fact that Steve was black didn't seem to phase her. The guys were soon sucking and fucking Charlotte while again I retired with Gail to our bedroom to enjoy her sexy body. It was a while later when we were resting that we heard Charlotte squealing loudly. Gail laughed saying that Charlotte now knew how big and hard Steve gets. We went down to see Steve driving his huge cock in and out my wife's pussy. Charlotte was still squealing occasionally when Steve's cock hit the right places. I was relieved when Steve finally pulled out and came all over Charlotte's stomach and tits. Harry was ready for a second go but Charlotte called a halt saying that Steve had made her far to sore. She had taken three loads of cum as well as Steve's load on her. Harry wanked and slipped his cock in just as he came to give Charlotte a fourth load. We resumed seeing Harry and Gail a few more times as Charlotte's belly again swelled as it filled with our third child. After the baby was born, Charlotte was again off sex and spent all her energy on the children. She told me that I could see Gail if I wanted and needed. I did a few times until Charlotte's libido returned. Now with our family complete we agreed that we didn't want any more children. So it was a surprise to me when Charlotte went onto the pill knowing it wasn't for me. Now in our fifties we still see Harry and Gail but not that often. Charlotte also wanted to enjoy Steve's huge cock again. So that she could we traveled to Harry's house and while I fucked Gail, Harry and Steve plowed Charlotte. This time I watched as he pumped his load in Charlotte's pussy and lots of it trickle back out as her pussy gaped open after he finished with her. I am ever so pleased that I wasn't selfish and allowed Charlotte the freedom to have children, even if they couldn't be mine. The fact that we enjoyed ourselves getting there was an added bonus and one we still occasionally indulge ourselves with.