While I can't comment upon Robert Michael's response to an orgasm, I will describe what occurs with my husband.
There is a change. Just before ejaculation, I notice that his body temperature increases, if even incrementally. He becomes more carnal with his movements. He moans louder. He curls his toes right before he is about to reach climax.
But I guess the kicker is when he does finally reach orgasm and he exhales profusely, as if giving a piece of himself to me via his sacred essence.
It takes time young Alexander Gaultier, but in time you too will master the ability to properly discern the point at which your man reaches climax.
Yours,
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