Some young men have expressed that eventhough circumstances could easily suggest the opposite, they are certain, without a doubt, that their girlfriends are being sexually monogamous. Without passing judgment, questioning anyone's moral standards, or condemning anyone, from the male perspective, is it ever really possible to "just" know without question, based on what your girlfriends' or female partners' behaviors may be during the act or otherwise, whether they are having sex with someone other than you?