There are countless men throughout television history but the ones who rank as "shoulda known whens" for my young gay mind were:
Tom Selleck
Fred Dryer
Michael T. Weiss (when he was on Days of our Lives. Amplified later on The Pretender. Don't even get me started on "Jeffrey".
Jameson Parker AND Gerald McRaney - "Simon and Simon"
Gregory Harrison
Willie Aames
Tony Danza
Greg Evigan - "BJ and the Bear" but more so "My Two Dads"
Tom Wopat
Michael Nader - "Dynasty"
Ted Shackleford - "Knots Landing"
Robert Kelker-Kelly - "Another World" (then "Days" then "Another World" again).