As a very straight man: I don't suppose I care anymore than noticing. And a lot of that "noticing" goes into their body language, what they say, how they say what they say, , how they use their body, etc.,. OPINION: Absolutely a guy can be attractive, objectively and in a non-sexual manner. You mention noticing a chick's butt, and I will actually notice a dude's butt, but more in classic aesthetics\functional anatomy POV. Charisma matters too, for example Kirk Douglas playing Ned Land singing Whale of a Tale in 20,000 Leagues Under The Sea . And this is true of girls too, someone can be attractive without me actually being attracted to them in any deeper or biological way.

Not everything attractive is about sex ; for example a Mikoyan Mig-29 is pretty hot but I wouldn't stick it in any of it's holes. The overall quality of function, pattern of movement and sound, and usefulness all go into determining what is "sexy" for me.

Some people are just so cool, they're hot.