'HE WHO IS WITHOUT SIN,....LET HIM CAST THE FIRST STONE!!!
as far as im concerned,sincererity is not a gender thing,so we should stop trying to get at each others necks here.Majority of both sexes are very insincere...so the whole thing boils down to morals,the way u were brought up and what u beleive in.
i sincerely dont believe that there is any yardstick for assessing the difference in sincererity amongst gender.