Here’s an 8-century Irish king (detailed citation) doing a good job of sexual reasoning about a mysterious birth:

A woman came to the king carrying a boy child, and put him into the king’s arms. “For your kingship and your sovereignty,” said she, “find out for me through your ruler’s truth who the carnal father of the boy is, for I do not know myself. For I swear by your ruler’s truth, and by the King who governs every created thing, that I have not known guilt with a man for many years now.”

The king was silent then. “Have you had playful mating with another woman?” said he, “and do not conceal it if you have.” “I will not conceal it,” said she, “I have.”

“It is true,” said the king. “That woman had mated with a man just before, and the semen which he left with her, she put it into your womb in the tumbling, so that it was begotten in your womb. That man is the father of your child, and let it be found out who he is.”

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