How does the rhythm of the iambic pentameter contribute to the meaning of "sonnet 130"?

The unbalanced rhythm emphasizes the subject's lack of beauty. The stressed syllables highlight the speaker's dislike for the subject. The consistent rhythm softens the speaker's unkind words about the subject.

imparadis't in one anothers arms  

the happier eden, shall enjoy their fill  

of bliss on bliss, while i to hell am thrust,  

where neither joy nor love, but fierce desire,  

among our other torments not the least,  

still unfulfill'd with pain of longing pines;  

yet let me not forget what i have gain'd  

from their own mouths; all is not theirs it seems:  

one fatal tree there stands of knowledge call'd,  

forbidden them to taste: knowledge forbidd'n?  

suspicious, reasonless. why should their lord  

envie them that? can it be sin to know,

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