Venus & the Ark response

At the start of the verbal reading of Venus and the Ark, Sexton mentions that her poem is "kind of a of a spoof". Spoof seems to be an interesting word of choice because it implies that at a certain level the poem was intended as humorous or jovial. I believe that Sexton referred to her poem as a spoof to call light obvious parody that resonates throughout the poem to Biblical references and posible mock the traditionally accepted belief in Christianity that God flooded the earth, ending humanity except just a single family to repopulate. 

The poem of the two PhDs (traveling in a rocket at the demise of the earth, seeking salivation along with other nonhuman creatures to bring to the new world) is a clear mimic of the Biblical figures of Noah and his family in the story of Noah and the Ark.  The spoof she might be referring to is that both PhDs in the end of the story are male, thus the end of the human race is inevitable. Perhaps she saw humor in the change from a hopefully ending found in the Biblical story to her own tragic ending on Venus.