I do not see why the author would try to highlight Poles in such a generalizing statement which is completely false and very inciting.
She simply did not get laid. Most of us do not shag anything that moves or is still worm to the touch, why should we?, when we have a pick of the litter so to speak. I'm guessing here but I have a deep suspicion that in her case even beer goggles won't help when it comes to shagging a Pole. Don't be deceived by her purring, she's not some cute ********, nothing feminine about her probably some mangina trying to shag Polish man, it will never happen.
I can assure you it is very common - certainly more than you think.
What circles are you moving in? Sure there's some of that here too but way lass than in any western country. Besides her accusation of them being gay stems from not getting any no matter how desperately she tries, let's just face the hard truth, there are some type of a woman that even a dog would have a hard time to get it on with her, so to speak. LOL