There's a lot of scope to generalise on this...
My Korean ex swears they are all sluts (well, she would say that, wouldn't she!)
I have had mixed results, once a French buddy and I tried our smoothest moves on a pretty average J girl we met while backpacking in Bora Bora (Thahiti) of all places!
She came back to the cosy villa we'd rented cheap as the resort was still being finished off, we plied her with cocktails, massaged her neck, and ego, now remember this chick was no Miss Japan, as you can see, but she was all we could find as Bora is a Honeymoon resort!
And in the end, and I mean we drank and entertained her till dawn! niether of us got anywhere... we thought she'd have been a surefire threesome candidate
given the place and the odds.
And as you can see from the picture proof that this really happened, I Bill, am on the left, me and my buddy are not fat old ugly dudes by a long shot.
PS No I don't care my pic is on here, my buddy don't care (he's French ces't la vie!) and the chick is hardly being defamed! She left with her honour intact!