There are more embarassing things I've heard than being called sexy though.
I think you may be missing some subtle points. I'm not sure if I still retained my feel for the Polish language, in my time "sexy" was used mostly in regards to girls.
Then again, I can't imagine telling a guy anything like that unless he/his friend asks. Mostly I'd only sy it to my own friends, like 'he's hot, stunning!' etc
I find that disturbing :)