With some help my research has led me to the influential feminist philosophers and their work on the historical canon. When gender bias is removed the canon stands up.
It's difficult to avoid the pitfalls of the whole gender debate when inquiring on this subject.
This blog provides some interesting experience:
http://peasoup.typepad.com/peasoup/2004/07/gender_philosop.html
My experience has led me to muse on angles of psychology and general human behaviour and has raised some questions. Do human beings, particularly male, form elitist subgroups within communities? Or do mildly narcissistic personality disordered males naturally gravitate towards the sphere of philosophy. I hypothesise that individuals who see themselves as part of the elite subgroup have a need to maintain their perceived superiority. This leads them to openly dismiss input from newcomers to their group and use such behavioural wiles as to diminish the experience of the newcomer. Moreover, they may loudly express their disagreement with a female's input whereas the disagreement with a males input may be expressed in much quieter terms. This creates an environment that does not nurture the budding philosopher, and may in fact drive the individual away from the pleasure of philosophical inquiry. [I'm indicating 'Real Life' communities not electronic based communities such as 'forums'.]