What Causes Bleeding Post Intercourse?

I been bleeding none stop every time i have sex.... My pap keeps cming back clear, today i had a colcospy... My doc said it look normal.... But still send for a biopsy, i have ti go back nxt weel.... She said i have Two options... She can either put a cream that will bring my ph balance down....or do the cauterized./.// to end the bleeding... What is more guarantee that the bleedimg would Stop?