Henry, by virtue of being assumed to be male -- although I haven't told you that he's the XY one -- by virtue of being assumed to be male is now liable to be drafted, which Mary does not need to worry about.
Henry, en virtud de ser considerado hombre -si bien no les he dicho si es XY-, en virtud de ser considerado hombre ahora es pasible del enrolamiento obligatorio del que Mary no tiene que preocuparse.