We know for a fact that sex affects behaviour.
The majority of men find women sexually attractive and have sex with women but have little significant sexual interest in men, and the majority of women find men sexually attractive and have sex with men but have little significant sexual interest in women, and that's the case in every human culture we've ever come across and seems highly likely to be biologically-based.
I don't find it at all problematic from a feminist point of view, therefore, to posit that female humans might be more biologically predisposed to some traits and behaviours than male humans, and male humans might be more biologically predisposed to some traits and behaviours than female humans. You could describe those traits and behaviours as "gendered", but to do that is to conflate them with traits and behaviours that have a cultural origin. Unfortunately, it's extremely difficult to distinguish which influences are operating where, especially since cultural influences often act to enhance and entrench biologically-based traits and behaviours.
For me the point of feminism isn't in saying, "There is no difference between men and women other than what's culturally imposed", it's in saying that men are not superior to women, whatever the differences between the average man and the average woman are, and that you shouldn't make assumptions about any individual based solely on whether they're male or female, deny them opportunities, force certain types of work on them, and so on.