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So I stumbled upon this sentence:
''Aside from a flexible vagina which is due to the pelvic muscles' elasticity [...]''
And I wonder, shouldn't there be ''because of''? Because it modifies the adjective ''flexible'', and for ''due to'' to be right shouldn't it have been ''the flexibility of vagina [...]'' ? But again, I know that ''due to'' must follow a form of ''to be'', which is present here.