Vaginal dryness and white/clear foul discharge only smell it during sex or masturbation. No itching burning or swelling. What could it be?

Vaginitis. could be normal or an infection so please get examination.
Bacterial vaginosis. is a possibility . Examination of discharge may be necessary to find the cause. See your gyn, I hope this helps. If you want to discuss the answer to your question that you are already submitted or if you do have more questions or other concerns kindly contact with me on my Virtual Practice at : www.healthtap.com/dryetimyan.