It will be pointless for me to define what "sexy" is as it can vary uniquely from one person to another like fingerprints --wait 'til RBY71 spots this thread! Be warned. LOL Now that I think about it, I don't really have one! All I know is someone is sexy if I begin having uncontrollable dirty thoughts upon first seeing the guy-- like your profile pic for example. That's sexy.
Sexy is what you think sexy is. And, what new age of gay are you talking about: the one where everyone is super judgemental and imposes impossible standards on eachother? LOL, that isn't new.
However, I can understand the confusion...."sexy", kinda confusing now that I think about it. Does it mean looking at him makes you want sex or he is a credit to his sex? I never understood and if it means any of the two then it's quite a grandiose compliment to be handing out indeed.
May I suggest your just calling guys you fancy, handsome or fine or very good looking as these are much more straightforward terms and I think more flattering. "Sexy"...WTF does that mean?
Sexy can be one single thing about someone, or a combination of a bunch of things -- great smile, cute sense of humor, a killer bod, great personality, confidence, intelligence, eyes you can't turn away from, etc.
P.S. and the guy GQjock posted in all kinds of S-E-X-Y!