Good that I saw this post. I was cuckolded by cheating wife last year which came as real shock. At time was 28 and she 31 and married for about 1.5 years. Neither of us had a lot of sexual experience as we were both raised strict Catholic and met at Catholic University. But, we did have very active but conventional sex life.
Last May she told me that she had to admit to huge mistake, and told me how a few days earlier, when she went to an old friend's housewarming lunch and party in her hometown (I didn't go, since it was about 2 hours away, and I didn't even know the friend) she met a co-worker of her friend's husband, a somewhat older (53) and they began flirting. This didn't surprise me, because although she isn't the most experienced, she is bit of a flirt and does like the attention men give her. Apparently as afternoon went on, they got more and more flirty and even though she told him she was married, he kept it up, complimenting her body, which she likes to hear (she was good college athlete in tennis and track, and still coaches and plays).
The way she explained to me later, she really didn't believe anything would happen, but with the constant attention, and being attracted to him in general -- his confidence, and successful/wealthy style -- she allowed it to continue, and he went as far as at one point, sliding his had down the back of her pants to rub her ass (although from where they were standing, it wasn't likely anyone could see him do that).
Really, it sounded like he just "dazzled" her, and she said that she would get jealous when he would be talking to other women there. At the same time, being married and so sexually conservative, she considered it all just fun, and thought soon enough the night would end and it would be forgotten. I will say, knowing my wife, she had maybe one drink, since neither of us ever drink normally, so that isn't a reason why, but when Geoff kept it up, and in the early evening he told her that if she wanted him she should go upstairs, she went up and he followed few minutes later and as she put it later to me when confessing it, "we began kissing, he got me into Sarah and Jason's bed and made love to me."
I was flabbergasted by the news, because it was just so far outside of our lifestyle. Really, I was too shocked to even talk about it, although about a week later we did discuss it, after she told me she was relieved that her period had come. That was a big sigh of relief for us both, as she had told me that he hadn't worn a condom or "pulled out". Once we knew we had dodged that bullet, we were able to talk a bit more intelligently and I said I would move past it.
Then (and I know this has gotten a bit longer than I intended, sorry) a few weeks later she told me that Geoff had invited her out to dinner for that evening, and that she wanted to go, and as she said it, she would: "give myself to him again" that night after dinner. I was not pleased, but if I am being honest, I wasn't that surprised either. We agreed that we weren't sure what it would mean to our relationship, but that we shouldn't make any immediate decisions until things between us were calmed down (although it wasn't like we were arguing or yelling).
Well, she went on that dinner date, came back at about 7:00 am the next morning and confirmed, as if it was even in doubt, that after dinner out they went to his house and gone to bed. Once again, he had not worn a condom, but she had used PLAN B.
In any event, again sorry for long post, she continued to date him for next few months. I was very reluctant to let her, but with each "date" they had, I became bit more accepting.