I agree with Sharni.... a bad smell is usually indicative of some kind of infection (i.e. yeast infection). There is really no delicate way to say anything about it... you just have to trust your relationship and tell her showing concern for her health.... yeast infections (however slight) not treated can lead to other problems....

I do have one question.... does she wear nylon or silk panties....? and if so, in some cases laundry detergent that doesn't get rinsed out well will cause a reaction with her fluids and can cause a smell...

Suggestion..... buy her some sexy cotton panties.... shouldn't be difficult to find and give that a go... it may help you and her....

Also... a yeast infection is contagious.. a man can get it as well....

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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.