Had protected intercourse and afterwards have to urinate more than usual. and when i do sometimes it burns what do i do ?

Painful urination ?: Painful urination after protected or unprotected intercourse can be a source of urinary tract contamination of bacteria commonly present in the anal/vaginal area, leading to both urinary frequency and "burning". Get a urine clean catch specimen done at your primary care doctor's or gyn doctor's office to make this diagnosis and create effective treatment.