From Sally Haslanger’s Changing the Ideology and Culture of Philosophy: Not by Reason (Alone):

Why there aren’t more women of my cohort in philosophy? Because there were very few of us
and there was a lot of outright discrimination. I think a lot of philosophers aren’t aware of what women in the profession deal with, so let me give some examples. In my year at Berkeley and in the two years ahead of me and two years behind me, there was only one woman each year in a class of 8-10. The women in the two years ahead of me and the two years behind me dropped out, so I was the only woman left in five consecutive classes.