its on Erid, long after Grace and Rocky figure out how to hug and snuggle. Eridians dont really do full hugs like humans because then you can hear everyone's internal organs that close so its a little weird, maybe tapping/hand holding is the usual affection. Everyone assumes the constant cuddling is purely for Grace's human needs benefit, and while Grace obviously does love and need the touch, Rocky being driven to space madness and having every form of ptsd means he is equal if not more in need of constant full body hugs because he likes feeling how alive he is.
So random eridian scientists are talking to Grace and are like, absolutely no disrespect intended, but very interesting Rocky overcame the cultural weirdness and sensory disgust of "hugs" and does them despite no benefit to himself because he cares for your needs! Its sweet!
Grace: actually Rocky freaks out if he cant press himself against my lungs and heart through the thinnest xenonite possible until he can hear every muscle cell in my body moving at least once a day.
Scientist: ok cool so hes kind of a total pervert then okay
