my wife, over ten years ago, had an intense, unhidden affair with a neighbour over thirty years her senior, the classic alpha male with whom I could not compete. He had two grown-up daughters, and I often heard them talk about his desire for a son, and my wife's willingness to accommodate him; if it hadn't been for his very jealous wife, I think they would have eventually done it, and I would have raised him as my own. After all, apart from the obvious ethical and practical problems, I don't think any cuckold can absolutely reject the hypothesis that his wife might be impregnated by her lover.