We had been together for 8 years, fucking on a regular basis from our second meeting (the first had just been oral for both of us) when she started to question why we hadn't even had a false alarm for pregnancy. We went to the doctors, she (supposedly ) went to the hospital and had tests that she said were fine, I gave a sample which I was told gave me a low sperm count. We discussed alternatives, but she said she really wanted the experience of carrying a child from conception. She admitted she fancied a guy she worked with, married with adult kids, bit of a jack the lad who lived a couple of streets away, and that he had flirted with her. I said it was up to her. A few days later I was at work and she rang. Apparently Glen had walked past the house with his dogs just as she was going to the local shop. She offered to make him a coffee when he had taken his pets home, and he was now sat opposite her in our living room, and she wanted permission to get fucked. Again I said it was her body, up to her what she did. A few hours later I got home. Yes, I had been hard most of the time. She was alone, fully dressed, preparing food. I asked what had happened. She told me then that she had just wanked him off, but promised more. We ate, the evening went on, we went to bed. I had my head between her legs when she said she had to tell the truth. Before she had even phoned me she had given him a bj, and he actually had his fingers up her as she talked to me. Then he had got her on her hands and knees on the carpet and done her doggy. It obviously turned her on telling me, and I loved hearing it. The only thing I asked was that next time she didn't wash afterwards so I could eat her out after she had been fucked. Her affair with him went on for a few months, then another guy started working with them, they had a 3som, and then it became more the new guy. She never got pregnant, I had a second test after the doctor discovered it was about 3 hours from my ejaculation to handing the phial in on my first and my sperm count was fine. We split after 10 years, reasonably amicably, the second guy moved in for a while but then went back to his wife and young kids. A couple of years later she admitted that she had never actually gone for the tests to see why she wasn't getting pregnant, and had used my negative test as an excuse to get herself fucked by the first guy. Added for gonefishin: We were fine for the first few years, she had a stronger sex drive than me, and I was actually happy she was getting fucked by someone else. But it did end badly, she tried to get me again despite me finding someone else,and I ended up blocking her on phone, email, etc.