Hazing in Black Frats

Im thinking of pledging a frat, but I always hear about the hazing. Now there is no way in hell im going to let someone beat on me, but my girl friend says if you stand up to them they have no choice but to stop (she wants to be a Delta), but others say you just have to come off line. Can any of you frat members give me any info?? Dont have to tell me any of your secrets but how big of a part is the physical stuff?? What about the sororities??