It is not only the man, but man and woman. You could say, calm down man, it is only speculation. I thought the same until I found a scripture in the Bible to clearly support this important doctrine. At this point for me there is no more speculation . Let's go now to the scriptures.
Many people think that the scriptures contain very few words about genealogy.
I don't agree totally. God put them in the best places to give us some hints. It means creation. The book of Genesis is the genealogy of the earth, in what way the earth was generate, and without the earth, no men at all, we are generate from her dust. We have 2 books of Chronicles in which is written only about genealogy.