Excellent question. "Feminist Philosophy" as a title covers a range of types of philosophy that are united in the goal of offering a critique of patriarchy and exploring the positive contributions philosophically that are made in light of being female (in terms of both gender and sex, and in terms of the extent to which gender is a social construct, etc). I take your point about why the term "feminist philosophy" seems out of place with the nature of philosophy because the term denotes advocacy and commitment to a particular position, rather than a more open-ended inquiry into questions of gender, sex, social realities, and the like. But I suggest that the term is no less philosophical than terms like 'Marxism' or 'Marxist philosophy' or 'Kantian philosophy' and the like. Perhaps your concern is (at heart) the worry that if a person is a self-described feminist philosopher (or Marxist or Christian or Idealist ...philosopher) this suggests that the person is no longer open to alternatives. Good point. But so long as a "feminist philosopher" could (in principle) abandon most feminist theories and remain a philosopher, this suggests that such terms need not be strait-jackets.
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Is there too much ideology in philosophy? I consider such areas as "feminist philosophy" to be a contradiction; how can one discover truths while constantly bound by an ideological method? Why not just restrict it to a "philosophy of women" or a "philosophy of sex" instead?