A sexy cry is a scene when a female character is put into a grieving situation and cries only mildly as to maintain the beauty or gentleness of the role they are portraying. Nearly all female roles in today's media carry out this unrealistic form of acting. It is perhaps more visually appealing, but the audience gains no empathy with the person facing the trauma. The overall effect is hindered.
But in Hecuba, Euripides knows how to appeal to logic through emotion. Hecuba herself brims with sadness, none of which is honestly unrealistic. You can feel her heart-wrenching pain. And when she cries, it isn't some quiet pathetic sob. No, this is true sadness - the kind that makes you a twinge of guilt and embarrassment for willingly observing someone literally break down. She doesn't hide it because it's not meant to be attractive! You feel her pain. That is more than you ever see in current media. That is Mimesis.
It doesn't even end there. Every character gives off such outspoken yet honest feelings that you can't help but agree with their pleads and causes, even if you disagree. Hecuba may not be able to convince Odysseus to let her daughter live, but she gives off not only reason but emotional appeal as well, until your heart strains with woe as Odysseus denies her any peace from her misery, or in her implore to Agamemnon demanding revenge, where you know that she has been driven to madness and yet you have sympathy for her. That is power and that brings out more rhetoric than just a pretty face ever will.

