That's a great video,
@Kvothe.
Girl on the far left arches her back, sways her pelvis, strokes the mic stand like it's a cock, sticks her leg out, has that really lusty grin on... she's oozing all kinds of horny sexual tells.
Neat comparing her with the blonde in the middle. The middle blonde is cute, swaying her hips, bobbing her shoulders, but she's just not moving in that "I am really aching for it" kind of way. Girl on the left sure is.
But yeah,
@James D, it's basically nonverbal signals that you are looking to shag. People exhibit different body language based on what they're out for. If you want to understand this better, try to get yourself into a deep sexual state, then get yourself around a girl who is also in that state, and pay attention to your body language. You will notice yourself moving, doing, speaking in certain ways you normally do not when not in that state. That is you oozing sex.
Chase