&gt; This gender =&#x2F;= sex is a recent concept invented by mankind.<p>I thought it was fairly recent concept too until I learned this tidbit in a Anthropology survey course:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Third_gender#Indigenous_cultures_of_North_America" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Third_gender#Indigenous_cultur...</a>