I have been wondering if I could tell if a person can be trained or not. What would I see that would tell me yes or no?

I watched a little Grantchester on Amazon Prime yesterday. In one of those episodes the vicar gets laid. His pal almost instantly knows.

A few years ago I saw a woman come out of the hotel elevator in Las Vegas. To me she looked like she had always looked, but a man in our group instantly knew she just got laid.

I verified it with her… But how did he know?
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