This straight guy was going to vote Robert Conrad as well.
This is a completely obvious point, I guess, but it’s amazing how subjective all these responses are. For quite a few I’ve clicked on the links and completely not “gotten” it. Christopher Reeves, for example - though generally a handsome man, in the picture the OP linked of him he looks like a sickly extraterrestrial. And Johnny Depp has never struck me as good looking at all.
So now it’s my turn to baffle someone else… In the movie “Drive” Ryan Gosling struck me as an almost absurdly good looking guy, in a way that screenshots on Google Image search aren’t quite capturing.
Also agree with others about young Marlon Brando and Paul Newman.
Antonio Moreno
Wallace Reid
John Boles
John Gilbert
Yeah, the first time I saw him, I just sort’ve goggled at him in astonishment.
As a straight guy, I figured this thread wouldn’t have gotten to the third post before someone mentioned George Clooney. Really? It took until post #54?
Shows how much I know. I think the guy’s pretty frickin’ handsome.
I wanted to pop back in to nominate Maximillian Schell. He aged very well too.
I am 100% straight, I could acknowledge men’s looks, but I have no room for them.
Not to toot my horn or anything.
Mmmmm…hot Nazi lawyer. 
Elvis
Or, Young Lee Majors http://www.fanpop.com/clubs/the-big-valley/images/8269749/title/heath-barkley-photo
and Steeve Reeves from the old Hercules movies http://workoutinfoguru.com/steve-reeves-workout/
and http://www.librarising.com/astrology/celebs/stevereeves.html
I think I look a little like Clooney, but mostly Gregory Peck. So I’m going to have to go with him.
I uploaded my pic to some website and it said I most look like Gregory Peck, Clive Owen, John Wayne, and Pierce Brosnan. They are all pretty good-looking, right?
Another straight guy here.
This!
To expand on my opinion, I was stuck by how he looked at the beginning of the 4th Batman film, first series. (“Batman and Robin” I think. Robin had already joined the team and Batgirl came in through it.)
I thought, what a perfect face for Bruce Wayne! There was both a gentle, warm quality to the face and expressions, and yet you see a man of tremendous strength of will, as well as physical strength and every prowess you can think of. Someone who would make waking life an ongoing nightmare for the criminals.
This title will always belong to Cary Grant. The other men mentioned are handsome, but they are not Cary Grant. That man can make you fall in love with him all over again every time you watch one of his movies. There is a warmth and humor there beyond just handsomeness that’s really hard for any other man to come close to.
Clooney is good looking, but mostly because he reminds me of Cary Grant. (It’s more his screen personality than his looks.)
Pierce Brosnan is generically, blandly handsome. He’s like the tux guy in Mystery Date.
No one has mentioned:
Antonio Banderas??? like in “Desperado” Antonio B.??
Aye chihuahua!
I will add Johnny Depp. Though he’s losing his looks these days, when he was younger he was just…beautiful. He had real beauty.