We are all alone with little or no research at all, same boat. psychologal effects may differ from sexes, but that has to do more with cultural differences and psychology in general, so you could research psychologal or sociological problems' differences between men an women in speech impediments, not only stuttering. May be a women suffers more (in general) while having sutter because women tend to be more communicative and having an impediment may impact her social life even more, it could be that, or it could be the other way around or no much difference, i guess that's is what you are looking for.