Lou and Lixy are right.... communication is the key to a healthy relationship. If you are to the point of checking her panties, then you are doubting her faithfulness already. There is no harm in talking about it, but if you are wrong, just by committing to the action of checking panties and posting a thread about it - in your mind, you already don't trust her. And that is something you and she need to work on together....

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A blessed thing it is for any man or woman to have a friend, one human soul whom we can trust utterly, who knows the best and worst of us, and who loves us in spite of all our faults.