Urethral irritation from excess sexual activity...or as a famous French writer described it,”the plentiful rubbing together of bacons.
a chronic nonbacterial inflammation of the bladder accompanied by an urgent desire to pass urine frequently and bladder pain; it is sometimes associated with an ulcer in the bladder wall (Hunner’s ulcer). The cause is unknown and *contracture of the bladder eventually occurs. Treatment is by distension of the bladder under spinal or epidural anaesthetic, instillation of anti-inflammatory solutions into the bladder, and administration of steroids or *NSAIDs. Bladder enhancement or augmentation (see cystoplasty) may be required for a contracted bladder.... interstitial cystitis
Health Encyclopedia