The title should be “Guys’ Insensitivities.” By making ‘insensitivities’ plural you require that the subject be plural as well. As such, the apostrophe must be after the ‘s’ thus making the word plural. When you have a subject that ends in an ‘s’ you do not add another ‘s’ to denote possession; you place the apostrophe after the first and only ‘s.’ It is pronounced ‘guyses’ but spelled ‘guys.’
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