Some handsome actors I have enjoyed watching over the years include some who were formerly mentioned: 
Brad Pitt, Russell Crowe, Jude Law, Keanu Reeves, River Phoenix, Clive Owen, Jonathan Rhys Meyers, Henry Cavill, Colin Firth, Jared Leto, Rob Lowe, Robert Redford, Paul Newman, young
 Marlon Brando, Cary Grant, Gregory Peck, Montgomery Clift, Clark Gable. And 
Humphrey Bogart was appealing even with his rough edges. Also, 
Jimmy Stewart was quite handsome and a good actor, despite being conservative and square personality-wise. 
Tony Curtis and 
Troy Donahue (very good-looking). Young 
Jack Lemmon also was attractive and funny. 
Leonard Nimoy quite handsome, intelligent, sexy. 
Sidney Poitier, handsome, stalwart, and sexy. 
Six-Million Dollar Man, 
Lee Majors, and 
Little Joe Michael Landon on 
Bonanza. [ETA: Forgot to mention how much I absolutely loved 
James Caan and 
Billy Dee Williams in the television movie, 
Brian's Song.]
Current young actors I enjoy that have been mentioned include 
Sam Worthington, Charlie Hunnam, Chris Pine, Luke and Chris Hemsworth and not mentioned: 
Robert Pattinson. Also 
Benedict Cumberbatch is uniquely attractive (those eyes, those lips). Oscar winner 
Eddie Redmayne has good looks and humongous talent. 
Mark Wahlberg also has a certain appeal, and I always found 
Liam Neeson to be ruggedly handsome and sexy. Also sexy and terrific actors: 
James McAvoy and 
Michael Fassbender. 
Terrence Howard is pretty and charming. 
Don Johnson and 
Philip Michael Thomas were pretty and dangerous. Plus I loved the original Bond, 
Sean Connery for his dangerous, sexy charm. [ETA: 
Ice-T is too pretty and dangerous for his own good. 
Ryan O'Neal was quite handsome but a dangerous playboy. Also, additional charmers include: 
Patrick Dempsey, Dermot Mulroney, George Clooney, 
Taye Diggs, 
Morris Chestnut, 
Michael Ealy, and Charlize Theron's ex-boyfriend, 
Stuart Townsend. In addition, I found 
Joe Morton to be handsome, loveable and cerebral in 
Brother From Another Planet. Multi-talented 
Jamie Foxx is ruggedly handsome and hilarious. I also found funny man 
Robin Williams to be quite irresistible in a loveable teddy bear kind of way, especially the young Robin Williams along with his best friend and sidekick, the beautiful 
Christopher Reeve. I kinda fell in love with Keira Knightley's Mr. Darcy, 
Matthew Macfadyen, in the 2005 film 
Pride and Prejudice.]
Not mentioned yet I don't think, but I always loved the unconventionally attractive and extremely talented 
Dustin Hoffman from his breakthrough in 
The Graduate and throughout his career. I had a thing for the young 
Robert DeNiro too, and also for 
Richard Gere. Another fine looking man and a superb actor, 
Christian Bale (always handsome from his child actor debut in 
Empire of the Sun and onwards). I was charmed by 
Heath Ledger and I loved the way he grew as an actor; his voice was quite sexy. While I thought young 
Tom Cruise was good looking, I fell in love more with 
Timothy Hutton for his tall good looks and his vulnerability.
I definitely had a thing for 
Benjamin Bratt and 
Chris Noth of 
Law and Order fame. Sexy man, deep sexy voice: 
Sam Elliott!!! (A lucky lady is his wife, Katharine Ross). Not conventionally handsome perhaps, but a great actor and a sexy guy both young and old: 
Jeff Bridges (watch young Jeff in 
The Last Picture Show, 
Thunderbolt and Lightfoot and 
Starman; he was quite sizzling in 
Jagged Edge and 
Against All Odds). I'd love to see Sam Elliott and Jeff Bridges star in a movie together at their current ages -- it would be great with the right script/ story.
Very sexy young men and moody, rebellious actors: 
James Dean and 
Steve McQueen (don't miss McQueen in 
Love With the Proper Stranger, with Natalie Wood).
My all-time favorite drop-dead gorgeous actor: the young 
Horst Buchholz, especially in 
Tiger Bay, with the young Hayley Mills in her film debut. Buchholz was also in 
The Magnificent Seven, and in  
Fanny, with Leslie Caron
:   http://www.cinemagia.ro/actori/horst-buchholz-19950/
ETA: I also can't forget to mention 
Ralph Fiennes, and his brother, 
Joseph Fiennes. Oh, and 
Dan Stevens of 
Downton Abbey fame.  Plus, 

  "Mr. Alright, alright, alright":  
Matthew McConaughey = sexy, funny, smart. 
Dirty Dancing's 
Patrick Swayze will never be forgotten for his down to earth charm, his smooth moves and his good looks.
And how could I forget the man for all seasons and reasons, the tall silent former 
Rawhide star and Man with No Name in Sergio Leone's spaghetti westerns who would go on to achieve super stardom: 
Clint Eastwood. In addition, the real life decorated WWII hero turned movie Western hero, 
Audie Murphy: 
http://www.imdb.com/name/nm0001559/
And, the beautiful tv singer-actors: 
Ricky Nelson, Davy Jones, and 
David Cassidy. I must also mention that I had a crush on the young 
Beau Bridges (older brother of Jeff Bridges).  In fact, Jeff and Beau clearly got their handsome good looks in part from their tall, charming, cheerful and handsome dad, 
Lloyd Bridges, who appeared in a lot of Hollywood B movies prior to achieving stardom on the small screen in 
Sea Hunt:  
http://www.listal.com/lloyd-bridges/pictures