" ’Tis true; then learn how false, fears be:
Just so much honor, when thou yield’st to me,
Will waste, as this flea’s death took life from thee...."See in text(Text of the Poem)
The speaker makes one final attempt to convince the young woman to have sex with him after she seems to accept, at least partially, his analogy. After killing the flea, she says that neither of them are “the weaker now,” which reflects the widespread 17th-century belief that the sexual act makes people weaker each time they engage in it. The speaker responds by arguing that, since her fears of the flea are ultimately unfounded, then her other fears must also be false.