what equipment they keep between their legs
Related to that, however, is the question of what hormonal influences may arise. For one example (of many possible), with males, you often see more aggression, and (obviously) with females, less. Pretending there can be no relevant differences WRT job performance is not an optimum approach. Furthermore, interactions between the people of significantly different sexual identity are of inherently different natures. Much as the incoherent would like you not to believe it, the vast majority of us are sexual creatures. We are naturally and unavoidably affected by other concerns than the specifics of today's TPS report.
Same thing goes for age, various cultural influences, parent or not, single or not, personal maintainance, presentation, health, mobility, superstition, depth of education, and means of education (conventional, autodidact, on-the-job, etc.)
Because of these truths, consideration should be given to such factors. And of course it is, and always will be. But mostly because of the law, much of this is now sub-rosa, which is entirely a bad thing -- a bad thing that at least partially offsets the benefits of the law overriding (or at least attempting to override) people who operate using a chain of reasoning that primarily incorporates blind prejudice rather than "how will this affect job performance?"
Politically correct often means "poorly thought out and mostly harmful." When there are differences, there are differences. Pretending otherwise doesn't make such things go away. It just makes them harder to deal with.