Has she been taking any new medications, prescription or over the counter? Certain drugs could greatly decrease her lubrication. Taking even just over-the-counter decongestant medications--anything that dries up your nose or sinuses, for example--can keep her from lubricating or diminish it a lot. (If it makes her nose dry, stops a sinus headache, or makes her mouth dry, it can also make her vagina dry, even when she is turned on.)

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Communication is the key.