My boyfriend recently very sexually active, I pee after sex, and I've had2 utis and I might have another one, how do I know and what do I do?

UTI. This is not uncommon. Frequent and aggressive sexual activity can cause swelling of the urethra in women (tube from bladder out). Drink large volumes of liquid, urinate frequently and you may want to change the sexual positions you are using so that bf's penis is not banging against the urethra, and if it keeps up you may need antibiotic prophylaxis.