You didn't see shirtless teenagers much in the 1960s. I was stunned. And hooked.
I saw him on tv a lot during the 1970s: not a lot of shirtless shots, but lots of intense, passionate same-sex relationships. For instance, in The Quest, which lasted for only 15 episodes in the fall of 1976, Tim and Kurt Russell play brothers who didn't grow up together, and therefore treat each other more like lovers as they travel the Old West in search of their kidnapped sister.
In The Runaway Barge (1976), Tim and Bo Hopkins, workers on a barge on the Mississippi, struggle to keep it from crashing with a load of chlorine, and end up walking into the sunset together.
Animal House (1978), Otter (Tim) displayed a beautifully tanned chest in a toga.
Unfortunately, he formed no strong bonds with any of the other boys of Delta House. Instead, he spent the movie sleeping with every woman in sight, including the Dean's wife.
I continued to go to Tim's movies for a few years. He was displayed in his underwear or nude a lot, but sometimes beefcake is not enough.
He often played horny teen slackers with little time for same-sex romance. In Up the Creek (1984), about an intercollegiate rafting race, his Bob has three buddies (Stephen Furst, Dan Monahan, Sandy Helberg), but doesn't buddy-bond with any of them.
New Sensitive Men (like Ryan O'Neal), slim and handsome, but so busy bedding women that they didn't have a lot of time for same-sex romance.
Or else Ordinary Guys and their wives and kids caught up in paranormal horror. In Impulse (1984), an earthquake in a small town gives everyone poor impulse control. Before long, they're fighting, stealing, and having indiscriminate heterosexual sex.
What changed? The shift from television to movies? From teen to adult? Or did the culture change, 1980s conservativism, mechanical bulls, "Real Men Don't Eat Quiche," making close same-sex friendships suspect?
I gave up in the mid-1980s. Since then, Tim has been in over 60 movies I've seen three.