I do not believe that there is any sexually egalitarian society in the world today. Sexual differences have been too pervasive in the world for there to be any society that has no difference in the power or status of the genders.
Differences in sex roles date back to the days in which physical strength was a much more important part of human existence. In those times, men (because of their strength and because they did not get pregnant) had a bigger role in things that seemed important to their societies (war, hunting, etc). From this fact came sexual discrimination.
Perhaps as strength diminishes as a useful attribute for human life, there will come to be sexually egalitarian societies, but it has not happened yet.