St Thomas was following the patriarchal sex/gender theory of his time, based on Aristotelian philosophy, when he tried -- and failed -- to reconcile such a view with our Christian faith, but now we know that human nature is fully shared by male, female, and intersex persons. This is very clearly explained in St John Paul IIs's Theology of the Body.  In brief, the body is male or female or intersex, and the body is a sacrament of the entire person, but is not the entire person, because we are "body-souls," not just bodies.  For this reason, I believe that women can and should be ordained, as soon as a pope decides it is time, to the ministerial priesthood and the episcopate.