One of the most iconic beefcake moments of my childhood came in
Mysterious Island, the 1961 adaption of
the Jules Verne classic about some Civil War soldiers who end up lost on a mysterious island with giant crabs, prehistoric auks, and Captain Nemo.
The 1960s version added some women to up the hetero-romance, but made up for it by divesting Michael Callan of his shirt.
The scene where he and his girlfriend get trapped by giant bees is still frightening today.

Michael Callan was the go-to guy for teenage beefcake in the 1960s, wandering between Disney, ARP, and anyone else who would put a shirtless scene. I've seen him as a bulgeworthy circus aerialist in
The Flying Fontaines (1959), a troubled high schooler in
Because They're Young (1960), a gang member in
West Side Story (1961), a teen dancer in
Gidget Goes Hawaiian (1961), and a rascally cowboy in
Cat Ballou (1965).
He also took off his shirt in
Bon Voyage (1962), The Interns (1962), The Victors (1963), and who knows what else?
Although he always seems to have his arms around a girl, many of Michael's early movies involve as much buddy-bonding as girl-kissing. He bonds with Warren Berlinger in
Because They're Young, Cliff Robertson in
The Interns, and
Dwayne Hickman (left) in
Cat Ballou.
The sitcom
Occasional Wife (1966-67) seems to have been a sitcom about a gay guy and his "beard." Businessman Peter (Michael Callan) knows that he can't get ahead without being married, so he convinces his gal pal Greta (Patricia Hartley) to pretend to be his wife.
Plots involve backstabbing coworkers, people suspecting their secret, and Greta's boyfriend suspecting that they're really involved, but no hetero-romance for Peter. You can see some episodes on youtube.
In real life Michael was married three times, and doesn't have a lot of gay rumors attached to him, though Dwayne Hickman spends many pages of his autobiography describing their warm friendship.