In developing the concept of gender, feminist theorists have enabled a much deeper level of understanding of the position of women to be achieved. It would be very difficult to dispute that there are such differences. But many of these differences which we assume to be natural have been and are subject to considerable change as the position of women in society has changed. So biology too is influenced by the social and material conditions of women's lives. Gender refers to the social construction of women, the ways in which women and men live out these differences, the meanings that are attributed to them, the roles they take up.
Gender is understood differently in different cultures and different historical moments.
As Arash has pointed out so clearly the context is necessary to appreciate the meaning. This is not the meaning understood within feminist theory. The logical extension of radical feminism is separatism. We see some parallels in Bahai circles eg when women are valorised for being more nurturing, tenderhearted and compassionate and this is then extended to imply that all women have these qualities and all men don't. Readers not familar with scholarly work in feminist theory may be familiar with names like Andrea Dworkin, Dale Spender, Mary Daly and Catherine MacKinnon as writers who have popularised this theoretical position.