There are two races of people -- men and women -- no matter what women's libbers would have you pretend. The male is motivated by toys and science because men are born with no purpose in the universe except to procreate. There is lots of time to kill beyond that. They've got to find work. Men have no inherent center to themselves beyond procreating. Women, however, are born with a center. They can create the universe, mother it, teach it, nurture it. Men read science fiction to build the future. Women don't need to read it. They are the future.