What makes the poet ask the girl to mark the flea? ( MEG 101 ) ( STUDY OF JOHN DONNE )

The poet in the poem "The Flea" by John Donne asks the girl to mark or observe the flea that has bitten both of them. The flea has sucked blood from both of them, and it has mingled in the flea's body. The poet uses this as a metaphor for the physical union between the two of them. He argues that since they have already shared their blood through the flea, they might as well share their bodies as well. The speaker is trying to persuade the woman to have sex with him, and he uses the flea as a way to convince her that physical union is not a big deal since they have already been united in some way through the flea.