Could be yeah, I don't do p4p and I've never actually encountered it in real life myself so assumed it was just a porn thing until my ex told me about their techniques. cant remember the exact words but she said Japanese guys like to feel they are strong and sorta heroic in their girlfriend's eyes. It's not all extreme like the whimpering tho, if you see lots of young couples where the girl is walking behind the guy, holding onto the fabric of her boyfriend's jacket, that was also an example she mentioned
An ex from Kobe told me this too. As in her words "Japanese guy always want to show they are powerful to girl"