YesButNoButYes lists controversial first in TV broadcast history.
1947: First Couple to Share a Bed - Mary Kay and Johnny, on...Mary Kay and Johnny
1957: First Toilet on Television. - Leave it to Beaver
1957: First Exposed Rack on Television - Jayne Mansfield, 1957 Academy Awards
1967: First Time the Word Hell was Used on Television - Star Trek
1971: First time the phrase God Damn It was used on Television - All in the Family (also one of the first gay characters: A closeted football-playng friend of Mike's came out on the show)
1972: First Abortion on Television - Maude
1974: First Rape Scene on Television - TV movie Born Innocent (I remember hearing about this in school.)
1977: First Recurring Gay Character on Television - Soap (although "The Corner Bar" had one in 1972)
When and who were the first TV couple who cohabitated together (not as in Mork & Mindy, but as an authentic couple)?