Ironically, when it comes to nursing, no small part of the gender difference is because of discrimination against male nurses by doctors, nurses, and patients.

Ironically, when it comes to nursing, no small part of the gender difference is because of discrimination against male nurses by doctors, nurses, and patients. Until that's addressed, we can't even begin to assert that Nursing is inherently a field dominated by a single gender. Ditto teaching, writing, and so forth. "discrimination of men in nursing" returns some great resources for looking into this further.