I understand all that, but the hormonal action wasn't called a suggestion. What was claimed was: "And from that point on you can't imagine what life would be like without him."
There's a place for hyperbole and I don't think neuropsychology is that place.
OK, I get your point. But in context, I don't think that was being set up as an iron-clad inevitability. (If it were, no girlfriend would ever break up with a boyfriend she'd slept with, and woman would ever divorce her husband. I think everybody knows this is not the case.)