Well explained! It's interesting that some things that are considered kinks (deviations from the ordinary or expected) might be mainstream in some cultures and therefore escape the definition of kink.

And some things that might be kinky in other cultures are not in ours. It's just a matter of what people consider "normal."

I had an occasional sexual partner once who came from outside the United States, from a very traditional society that was sexually straight laced. In one of our first encounters, I pulled his T-shirt off. Is undressing somebody a kink? Not to me, but It adds something to the experience for me when my partner enjoys it.

This partner seemed fine with it. Then I started caressing his chest, which he also seemed fine with and reciprocated. Then I just lightly pinched one of his nipples, not enough to cause even slight pain.

"Ooh, you're so kinky," he whispered.

He wasn't upset, and he seemed to enjoy what I was doing, but he sounded fairly scandalized by it.

Talking later, after a mutually pleasant hour in bed, he told me that in his culture touching a man's nipple is taboo, so for him, doing what I did was a kink, albeit one he enjoyed.

In my gay American cultural world, touching another man's nipple is just an ordinary sexual activity on the menu of typical sexual activities. Defining it as kink would be pretty difficult, unless you got carried away with it. To wit, some American gay men use stretching devices that greatly enlarge their nipples over time.

To me, that's a kink — not one I disapprove of, just not one that I personally find stimulating or attractive.

But at what point does a practice like that become a kink? I guess it all depends on what your norms are!