This is pretty mild compared to some of the things in this thread, which are frankly, disgusting.
A couple of years ago, I dated, a few times, this Japanese guy, who asked if we could watch some of his Japanese porn together. He was really into tits (which was why he was into me,

I suspect.) Most Japanese porn has a kind of "mosaic" censorship, which obscures penetration and the genitals. We were watching this large breasted girl and a guy do --something they call pazurro-probable not spelled right -- that we would call tit-fucking, or a boob-jack --and it had this mosaic obscuring the action. I just broke out in laughter! It seemed so ridiculous!

Here we have tit fucking, but you can't see either the penis or the tits!

It just seemed so silly to me!
But he was not amused at all, was offended by my laughter.

Just grabbed his DVD and left. That's my most embarrassing moment in porn.
Lindy