In the psychodynamic approach Freud argued that because girls do not suffer the American oedipal complex that boys do, they do not identify with their mothers in the same was that fathers and sons do therefore will develop weaker superegos.
Early research conducted into the fight or flight response exclusively used male lab mice because they experience fewer hormonal fluctuations and so changes in adrenaline, due to environmental stressors, could be more reliably measured. However, results from these studies were then generalised to females, ignoring differences between the two sexes (e.g. speed and extent of the fight or flight response).
Female researchers may receive lessfunding as their role as serious psychologists may be questioned.
the male viewpoint/behaviour becomes the 'norm' or the model for behaviour generally which could lead to female behaviour being viewed as 'abnormal', resulting in prejudice, discrimination, and sexism being viewed as normal and acceptable.