Women and men domination is interchangeable. Men can dominate women, and women can dominate men. However, if a dom man and dom woman get together, the man doms. The woman only doms if the man is a sub. HOWEVER this does not apply if the woman is actually a futa, in which case she doms regardless of whether the man is a dom or sub. In my mind, all futas are naturally doms, therefor an encounter with a sub futa is impossible.