In societies where a man can see a woman's face and discern the shape of her body, there must be an evolutionary advantage at work there. This advantage is also derived from desegregated public places, employment, schooling, and business where men and women can interact as normal human beings do: freely and naturally. In such a society, the future generations benefit evolutionarily because love and baby-making are a consequence of chemical attractions and unconscious signals acted upon naturally and intrinsically. Healthy and fertile women in an open society are more able to give birth to healthier babies.
But in societies where women are physically and personally concealed and kept apart from prospective mates, this advantage is short-circuited. Tribalism certainly depends on this attitude towards females ---and that's why there's so much inbreeding in those societies. Maybe this explains the prevalence of mental illness and degeneracy in those peoples where unhealthy mothers are more likely to have the opportunity to give birth to martyrs (i.e., jihadists) than they would in normal societies where their wombs would rightly be left barren.