People do not like to believe that they do not know what is going on. It is far easier for them to believe that the reason behind people's actions is due to their conscious decision making than some implicit knowledge. Surely males and females roles in society are becoming more and more equal so that the differences in their skill should be reduced in years to come. If our hormones do affect our spatial abilities testing females should be done at different stages during their menstrual cycle. I think it is important that hormonal levels are taken into consideration when dealing with the spatial abilities of both males and females.
Hormones do affect a lot of our responses and the levels are constantly changing.
I would agree that the fact that testosterone levels in males had no effect on spatial abilities would go against sexual selection. I am not sure how long it would take for evolutionary pressures to develop but I am unsure as to the reason for male spatial ability being different to women's due to the use of weapons for hunting. Our skills now do not relate much to those used then. I think this is a definite possibility and that research looking into the social aspect of the problems may be helpful. Males and females do tend to tackle problems from different angles and may see things in different ways.