Hello Thanks for your query,based on the facts that you have posted it appears that you have burning urination and soreness of penis since recently after having sex with your wife who has white vaginal discharge. This is most likely to be due to infection of the glans penis or UTI transmitted through vaginal intercourse . However looking at her relationships with other partners possibility of getting STD has to be ruled out by doing blood tests for STD and swab test of fluid from urethra has to be done to confirm the diagnosis. In the mean while take take broad spectrum antibiotic like Cefexine or Doxicycline along with anti inflammatory drug like Diclofenac twice daily. Ensure to wash your genitals with warm water twice daily Ensure to avoid sexual encounters till it heals up completely.