Gender is a socially constructed definition of women and men. It is not the same as sex (biological characteristics of women and men) . Gender is determined by the conception of tasks, functions and roles attributed to women and men in society and in public and private life.
The new gender politics is both refreshing and confusing. The young people are really redefining ideas about gender. I sometimes have trouble getting my head around this, but I find it interesting. I remember being denied to right to do many things that I wanted to do (such as play football) when I was a child. I think things are getting better but we still have a long, long way to go.