How the Lord’s birth is transcendental

A forest fire begins when two pieces of wood rub against one another, being agitated by the wind. Actually, however, fire belongs neither to the wood nor to the wind; it is always different from both. Similarly, here it is to be understood that the union of Kasyapa Muni and Aditi was not like the sexual intercourse of ordinary human beings. The Supreme Personality of Godhead has nothing to do with the human secretions of sexual intercourse. He is always completely aloof from such material combinations.

Srimad Bhagavatam 8.17.23 purport