テフヌトとシューの双子の創造神話には、いくつかの異説がある。どの説もテフヌトは単為生殖の産物で、何らかの体液が関与している。
ヘリオポリスの創造神話では、アトゥムがくしゃみをして、テフヌットとシュウを生み出した<ref name="Hassan">Hassan, Fekri A, Ancient Goddesses, British Museum Press, 1998, isbn:0-7141-1761-7, Lucy Goodison , London |pages107, chapter:5, Christine E. Morris</ref>。
In the Heliopolitan creation myth, Atum sneezed to produce Tefnut and Shu.<ref name="Hassan">{{cite book |last=Hassan |first=Fekri A |title=Ancient Goddesses |publisher=British Museum Press |year=1998 |isbn=0-7141-1761-7 |editor=Goodison |editor-first=Lucy |editor-link=Lucy Goodison |location=London |pages=107 |chapter=5 |editor-last2=Morris |editor-first2=Christine |editor-link2=Christine E. Morris}}</ref> [[Pyramid Texts|Pyramid Text]] 527 says, "Atum was creative in that he proceeded to sneeze while in Heliopolis. And brother and sister were born - that is Shu and Tefnut."<ref name="Watterson">{{cite book|last=Watterson|first=Barbara|title=Gods of Ancient Egypt|publisher=Sutton Publishing|year=2003|pages=27|isbn=0-7509-3262-7}}</ref>
In some versions of this myth, Atum also spits out his saliva, which forms the act of procreation. This version contains a play on words, the ''tef'' sound which forms the first syllable of the name Tefnut also constitutes a word meaning "to spit" or "to expectorate".<ref name="Watterson" />