Granting the general assertions that there are divisions of labor, distinctions between normative male and female roles, and that these are rooted in nature, it is possible to think, inspired by observations of nature, including humans, that nature has made a degree of flexibility available,  that her creatures might be better equipped to meet contingencies.  Sebastian Junger touches on this in his short and excellent work of speculative anthropology, "Tribe: On Homecoming and Belonging."  

I'd ask you to consider that while the rule you invoke may indeed be an expression of nature, and therefore God, what we regard as exceptions to that rule may actually be expressions of the deeper agenda of such divisions, the welfare and survival of the species.