I should start this out by saying that I believe that in most cases of rape, the majority of the blame falls on the man (or aggressor, it is sometimes a woman).
However, at the same time women are in control of certain things. For example they choose clothes they wear, the locations they put themselves in, if they are going to drink. Thus, while it's not the woman's fault, women are (generally) able to avoid situations where rape is likely to occur.