Truth is partial in that the individual perspectives that yield and judge truth are necessarily incomplete. No individual can understand except from some limited perspective. Thus, for example, a man experiences pornography as a man with a particular upbringing, set of relationships, race, social class, and sexual preference, and so on, which affect what "truths" he perceives about pornography. A woman experiences pregnancy as a woman with a particular upbringing, race, social class, set of relationships, sexual preference, and so on, which affect what "truths" she perceives about pregnancy. As a result, there will always be "knowers" who have access to knowledge that other individuals do not have, and no one's truth can be deemed total or final.
Because knowledge arises within social contexts and in multiple forms, the key to increasing knowledge lies in the effort to extend one's limited perspective. Self-discipline is crucial. My perspective gives me a source of special knowledge, but a limited knowledge that I can improve by the effort to step beyond it, to understand other perspectives, and to expand my sources of identity. To be sure, I cannot transcend my perspective; by definition, whatever perspective I currently have limits my view. But I can improve my perspective by stretching my imagination to identify and understand the perspectives of others.
Positionality's requirement that other perspectives be sought out and examined checks the characteristic tendency of all individuals - including feminists - to want to stamp their own point of view upon the world. This requirement does not allow certain feminist positions to be set aside as immune from critical examination.
When feminists oppose restrictive abortion laws, for example, positionality compels the effort to understand those whose views about the sanctity of potential human life are offended by assertion of women's unlimited right to choose abortion.
When feminists debate the legal alternative of joint custody at divorce, positionality compels appreciation of the desire by some fathers to be responsible, co-equal parents.
And (can it get worse?) when feminists urge drastic reform of rape laws, positionality compels consideration of the position of men whose social conditioning leads them to interpret the actions of some women as "inviting" rather than discouraging sexual encounter.