How many poly relationships have been that you know of have been created through cuckolding

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How many poly relationships have been created through cuckolding do you think

 

[jusme]

I have had a few with ex's but none with my present wife, although she has talked about it. My first wife had a friend that became homeless due to divorce and he lived with us in the spare room for about a week before it become obvious he was interested in Jen. We had too much to drink one night and we all went to bed together. This went on for a few weeks before it become obvious our bed was to small. After that she would sleep alternatively between me and him. After a few months until Jen fell pregnant and he found a new home. she still saw him for a while but he got with another woman and broke away from us. we did have a few more relationships With other men and one with another woman, but I was not allowed to touch her, lol.
There was more in the lines of that with another ex after Jen but that's another story