Japanese porn and female-on-male nipple play

In most Japanese porn flicks I've seen produced in the last 10-15 years, I've noticed that the women in those pay just as much attention to the guys' nipples as their genitals. And the guys all seem to love it, with no exceptions.

I've also experienced this personally in all my years of visiting Asian-owned “happy ending” massage parlors. As soon as it's time to finish me off, she's either caressing or sucking / licking my tit at the same time that she jerks my wiener. Every single time, every single parlor. Not that I'm complaining. It feels really good and makes me cum that much harder.

By contrast, most American porn gals I've seen don't even bother. Non-Asian escorts don't even mess with that area unless asked.

Why do you suppose there's such a huge cultural difference when it comes to that?