I would ask if she's been to the ob/gyn recently,if the odor is really that bad it could be a number of infections that she could not be aware of, mainly bactirial vaginosis,which is probably the culprit.That would not be a worry for You since Men don't get B.V. that is easily treatable.A really bad yeast infection causes odor also and is easily treated.Either way if theres a smell theres a infection or an imbalance,pantyhose wearers also seem to be really succebtable to infection since they hold in the body heat.