I don't have vasas but that head banging body swaying doesn't look sexual. When Bokka (U2) used to do that I knew he wanted to go to bed or come to me. Are you sure its mating body language she is saying? The room looks dark so maybe she wants bed time?
Eva is quiet and usually makes a sort of Bob-White whistle. For 2 months, other than that, she has been as quiet as a bunny. Last 24 hours, new rituals, body language, calls, etc. Moses, normally a whiner, has began to whistle and mumble. Perhaps getting comfortable and telling us something else.....time will tell.