In this combined video of The Graham Norton Show, Matt Damon is a guest on two different episodes. On one of those appearances, Jessica Chastain is sitting beside him. These accomplished actors have co-starred together in two different films - Interstellar and The Martian.
During the 5:49 - 5:52 segment (and for an instant during 5:34), Jessica Chastain can be seen slowly and gently stroking/caressing the inner portion of her lower arm (forearm), upper arm, and across the antecubital fossa (the region opposite of the elbow, on the inner portion of that joint).
Take some time right now to gently brush this same portion of your own arm. Do this on your bare arm. If you have forgotten, this region of skin is extremely sensitive. To be blunt, when touching this area so gently in this same manner as Jessica is doing - is a form of self-stimulation. There can be no doubt that Jessica Chastain is sexually attracted to Matt Damon.
In a close-up of Ms. Chastain's face, we can see her pupils are dramatically dilated. The fact that she's in a studio under bright lights (which, of course, would normally cause pupils to constrict unless there is another significant influence), and barring any pharmacologic or medical causes (which are not being implied, nor at all likely here), and coupling this finding with the above noted caressing of her inner arm - Jessica's dilated pupils indicate sexual attraction.
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