I read once that the soap opera "Capitol" (which would be great if it was revived in primetime) had its character, Matt McCandless, shirtless for the entire summer of 1982 to boost sagging ratings. That actor was Christopher Durham.
but I think the trend of the gratuitous shirtless scenes (hilariously parodied by Carrie Fisher's casting director in "Soapdish") and the casting of increasingly buff actors started with Don Diamont on "The Young and the Restless". He was a pool boy which meant he was shirtless a lot. Unfortunately few YouTube videos exist of all of him, but he was gorgeous.
By 2000, at least every soap opera had about 2 or 3 hunks. There used to be a site, Shrine to Soap Hunks, that can be viewed once again on web archive, its a treasure trove for old people like me (lol, im 32) who used to watch the soaps back when they were so popular a whole TV channel was created for them (SoapNet).
Soap operas provided a great launching pad for hot guys to get acting jobs. There were so many... who was your favorite all-time soap opera hunk?