In my experience, presenting as 'girly' made no difference with men -- they often don't take anyone 'female' seriously, though always willing to grab thoughts, ideas and even terminology and research and present it as their own brilliant insights and work. But -- other women really do find it difficult to impossible to take feminine presenting females seriously -- and in many many cases deliberately won't do so. Anyone presenting as conventionally attractive is by definition, and in fact must be -- dumb. And, of course, can only sleep her way into any position that matters.