"Initially human beings were unable to reproduce on their own, but were later modified with the help of Enki and Ninki. Thus, Adapa was created as a fully functional and independent human being."
https://www.ancient-origins.net/news-human-origins-folklore/origins-human-beings-according-ancient-sumerian-texts-0065
"The savior laughed and said, The snake instructed them to eat of the wickedness of sexual desire and destruction so that Adam might be of use to the snake."
http://www.gnosis.org/naghamm/apocjn-meyer.html
How did ancient humans know how to reproduce via sex?
https://www.reddit.com/r/NoStupidQuestions/comments/7df2kx/how_did_ancient_humans_know_how_to_reproduce_via/