Manu who was the first son,   Brahmi who was the first daughter of Brahma, came into existence  as ardhnareshwar  form of shiva explained them about the existence  of the mortal being The mortal being for whose existence  we need male and a femaleBut The curse " you shall Desire what not to be desired " By narad to brahma It was a time for the existence of the curse to come true as curse can't  go to veil So brahma started seeing her daughter with a evil eyeBrahmi stated to move in all directions but brahma head appeared  on each side and even on top Brahma -