So we heard this show had a plot... or something like that.
The 100: Bellamy and Lincoln are both very handsome men with absurdly well-sculpted bodies, and they each go shirtless at least once a season, culminating in them having a shirtless sparring match with each other in Season 3. It can dip into Fan Disservice, depending on your viewpoint, when they're forcibly stripped by Mount Weather in Season 2.
Angel: Angel spends many of his Buffy appearances shirtless. He does this a lot in his show too, walking around in just a towel at times. He likes Tai Chi. He's often bound up and tortured. He's even been bound by a vampire dominatrix more than once. Plus there was that one incident that involved him falling on top of Wesley while nude.
The Groosalugg, nuff said.
Lindsey is this too, especially◊ in his shirtless return in Season 5.
Andromeda: Tyr was six-and-a-half feet of solid Hunk with long eyelashes and pouty lips, a racial tendency towards minimal clothing and "bad boy" behaviour and a tragic backstory.
Lee "Apollo" Adama is one of Galactica's surest sources of Estrogen Brigade Bait. Let's just say viewers were very happy about the amount of time the crew of Galactica spend in tank tops, or better yet, shirtless. Lee gets a truly spectacular scene◊in season 2 where he accidentally drops his towel in the pilots' locker room.
Samuel Anders is Estrogen Brigade Bait personified. He is naked in goo in "The Plan!" With hair.
Blake's 7: Tarrant was originally conceived as a battle-scarred middle-aged man. Then Steven Pacey turned up to audition and the producers saw the effect he had on the female office staff... Blake, Avon and Vila are all adorable, all often shirtless.
Blood Ties had Henry Fitzroy. Not only is he a bishonen vampire with sexy curly hair and a tragic romantic past, but he spent large quantities of the story with his shirt off or ripped to shreds, lounging/writhing around in bed (again shirtless). He's also artistic, multitalented, superstrong, cute, chivalrous, and has a lot of funny stories about his past. All that, and he can give women orgasms with his bite.
David Boreanaz's character Booth. "Booth is a big, strong, hot guy who wants to save your life. You actually have a knight in shining FBI standard-issue body armor, so cut him some slack."
TJ Thyne at 2:02 in this clip is proof that the makers of the show love you and want you to be happy.
Cesare from The Borgias. The very first time we see him he's naked, and he spends rather a lot of time wearing tight leather trousers despite being a Cardinal, whose usual garb is not remotely sexy (unless you dig big red dresses).
Jesse Pinkman. Although usually subverted, with his baggy and ridiculously oversized clothes on display, but he does get his fair share of shirtless scenes in season 2. Although his attractiveness is rarely referenced in the show, in season three he gets a particularly fanservice-y scene where he is flat out flirting with the cashier while wearing more form fitting clothes than his usual attire. She even refers to him later saying "His eyes were really blue." Hank also refers to him as dreamy in the same scene based off her description.
Tedd Beneke is often shown as shirtless or semi nude in a lot of his appearances.
Interestingly enough, the fair share of nudity or semi nudity in this show deliberately comes from the old and average looking men in the show, so you could say this trope is averted for the two exceptions of Jesse and Ted.
Spike. The snark. The badassery. The fact that he spends most of season six of the show wearing NOTHING and what time he doesn't spend shirtless (and sometimes pants-less), he tends to spend wearing form-fitting t-shirts or an Intimate Open Shirt. He, like Angel, is no stranger to being the Distressed Dude in chains either.
Angel. Shirtless often. The man likes his tai chi. He really is something to look at, and he's often chained up and tortured. He's even been bound by a vampire dominatrix more than once.
Riley has a few moments too, though his good-boy persona made it harder for the show to find excuses for it. Generally, if they dated Buffy, they filled out this role to some capacity.
Xander counts too, especially in the "Go Fish" episode.
Burn Notice: Michael Weston, who spends a lot of time working out shirtless.
Cole and Leo are the two greatest examples, and two sides of the same coin. Cole is a demon, and fits the handsome bad boy type. Phoebe gets to play the fantasy of turning the bad boy good. By contrast, Leo is quite literally an angel. He plays the nice guy, hid under the guise of a carpenter (VERY helpful and VERY good with his hands, too!) and is all about love and goodness. And yes, both of them have had Shirtless Scenes.
While Cole and Leo were both fairly developed and well-rounded characters, the pure Mr. Fanservice would have been Dan from Season 2. Hunky former baseball player turned handyman next door, he seemed to only exist to stand around in tank tops and be that nice guy that Piper saw as her perfect life that she couldn't have with Leo at that point.
In the 2003 Children of Dune miniseries, Leto Atreides II spends a large amount of his screen time looking like a shirtless Adonis.
Chuck: Special mention must go to Captain Awesome, who is quite deliberately Fanservice, with the amount of screentime he spends wearing either very little, or something very tight.
Community: Jeff Winger and his naked pool game. Thanks to a scene involving Jeff, a locker, and a shirt that wasn't working, there's probably a lot of happy viewers (both female and male) after "Origins of Vampire Mythology". Also, raspy, sexy vampire!Jeff in "Horror Fiction in Seven Spooky Steps". Then there's shirtless, post-Hulk!Jeff in "Contemporary Impressionists". Aaand just to top it off; shirtless, leather pants-wearing, eyeliner-clad, gothed-up Jeff in "The First Chang Dynasty".
Carlos Fonnegra on Continuum, played by Victor Webster, is, well, in the words of MST3K, a "Stump BeefKnob/Gristle McThornBody". note Check out the list of nicknames for Dave Ryder, as pretty much every one of them applies to him He's a beefy police officer that somehow manages to be both a pretty boy and ruggedly handsome at the same time. Just lookat him. In one episode, an attacker catches him by surprise in the shower, followed by a fight scene which he remains nude for the entirety of, complete with (since this is still on a mostly family-friendly television station) precise editing and camera angles. Very precise.
Coronation Street: Various male characters both past and present have been used for fanservice. Some examples being; Jason Grimshaw (Ryan Thomas), Nick Tilsley (Adam Rickitt/Ben Price - especially during the Adam Rickitt era), David Platt (Jack P Shepherd), Todd Grimshaw (Bruno Langley), Tommy Duckworth (Chris Fountain) and Jamie Baldwin (Rupert Hill).
Morgan. Hoo boy, yes, Morgan. Most especially: coming out of the shower wearing only a Modesty Towel in seventh season episode "Snake Eyes", with every inch of him showing a sheen of water droplets. A moment that caused many a remote control to wear out and smoke as it was constantly brought back up to the screen...In-Universe, Garcia constantly flirts with Morgan and teases him over his sexiness, although their relationship remains platonic. Morgan flirts with and teases her right back.
Hotch has his moments, particularly if you like your men in a nice suit, though when seen without it — as in Season One episode after a fade-to-black with his wife — he proves nearly as impressive as Morgan. And Reid gets a fair share of attention as well, for those who like their men pretty, nerdy, and in distress.
The Crown (2016): Matt Smith as Prince Philip, Duke of Edinburgh, of all people. A few topless/nude scenes do a great job of showing off an impressively muscular physique. Truth in Television, since the Duke was a military man in his younger days and kept extremely fit. He was also widely considered to be devastatingly handsome, at one point being described as looking like "a viking god".
One episode has Nick Stokes shirtless after he realizes his shirt has blood evidence on it, and asks lab tech Wendy to remove it. She seems quite pleased with the results.
Several of the other guys on this show got this treatment two. An early episode in season 1 had Warrick Brown taking off his shirt and diving into a pool to search for evidence, and Greg Sanders and Sara Sidle were brought into a shower after they were in a contaminated scene. As Sara says "I saw everything."
Danny Messer on CSI: NY at times. It's especially noticeable when he's only in his undershirt and on the promo poster modeled after the high rise construction workers' lunch, but he got one or two shirtless scenes onscreen too.
Dark Desire: Darío is a quite handsome, muscular young man who's often shown in shirtless scenes. A lot of these are while he's having sex with Alma, but not always-the series needs little excuse for him to take it off.
Dear White People: Troy in Episode 3 has about two sex scenes with Coco and later Nieka Hobbs along with a shower scene showing his bare ass.
Desperate Housewives: John, Gabrielle's gardener, whom she was having an affair with. The series spends most of his screentime emphasizing his attractiveness (did he even own a shirt?), with Gabrielle busily ogling him in the background. It's pretty obvious he wasn't hired for his acting.
This was not an uncommon role for male companions in the Classic series, due to the relative rarity of conventionally handsome Doctors and the fact that the show took its "family show" concept rather more literally in the beginning, very deliberately making sure that everyonein the family could find something to enjoy, including dirty Mums. A good example is First Doctor companion Steven, who spends most of his time wearing very tight-fitting polo necks, getting restrained by female aliens, and smoldering, though some one-shot characters in the historicals fit the bill too.
Captain Jack Harkness from Doctor Who and Torchwood is a character that flirts with anything with a consciousness. His appearances in Doctor Who, especially, make no qualms about spending a lot of time admiring him. A prime example is in "Bad Wolf", where he is stripped naked on TV in front of millions of viewers. Jack is, perhaps unsurprisingly, delighted by this.
Dollhouse has Paul Ballard, played by Battlestar Galactica's Tahmoh Penikett, who was introduced boxing, shirtless, and wearing low, low-riding pants. From there, he went on to take his shirt off in pretty much every other episode.
James van der Beek as himself on Don't Trust the B---- in Apartment 23. Particularly lampshaded in the episode "Sexy People ..." where he walks into June's bedroom, spills a peach smoothie on himself so he has to take off his shirt, then spills it on himself again so he has to take a shower.
Dr. Quinn, Medicine Woman: Sully. He was often without his shirt and had some bathing scenes. Plus tossing a tomahawk shirtless must be one of the sexiest things ever.
Elementary has star Jonny Lee Miller frequently shirtless (including his introduction) and at one point is even tied to a chair shirtless. Hot.
Eddie is a friendly, blonde hunk with a square jaw and a well-built frame. This seems to be his intent, as he freely admits to Barry that he was a short, fat kid in the past.
Barry isn't as obvious, but he is a cute guy in his twenties who every now and then gets a Shirtless Scene. Even the disfigured "Savitar" version of himself is seen by some as a case of Evil Is Sexy. Unfortunately, he keeps getting upstaged by Oliver (see the Arrow example above), as everyone thinks Oliver is even hotter than Barry. Including Barry's wife.
Even back in The '50s they did this. Once per Episode in Flash Gordon (1954), Steve Holland would have a mandatory scene where he'd enter the cabin of his rocketship while still changing his shirt, revealing a well-muscled chest.
Friday Night Lights: Being a show about high school football, this is more-or-less true of most main cast players. But Tim Riggins takes it to another level.
The titular Galavant may qualify as this, as shots and/or scenes of him shirtless are quite loving and shameless. Taken Up to Eleven during this number from the season two premiere.
Mike Chang. He can't sing, but Harry Shum, Jr. can dance. And we get to see his abs.
Sam spends the majority of season 2 without a shirt for apparently no reason other than the fact that he has abs. Seriously.
Blaine is an interesting case. He plays an out and proud gay student, but the female fans can't get enough of him (particularly because he's played by the handsome Darren Criss). The writers have taken notice (an episode of season four gives the fans substantial Female Gaze in the form of a close up on his bum as he bends over in slow motion).
The season four episode "Naked" has all of the guys posing for a "Men of McKinley" calender. Cue the montage of all of them working out in various states of undress.
The Rocky Horror episode, featuring scenes like Finn walking down a full corridor in nothing but his underwear, Sam on a scene wearing just a pair of tiny golden shorts, Emma ripping Will's shirt off while singing a song about sex to him, and Finn and Sam taking a bath together.
Green Wing: Mac with his blonde "lion's mane", and also a shirtless wrestling scene with Guy in front of a fire in one of Mac's coma dreams.
Hallo K 3: Bas has quite a few shirtless scenes for a kids show, even when it is completely unnecessary like in the first episode of season 3, where Kristel wants him to take off his shirt so she can massage him better (Yeah right) and a daydream sequence of Kristel imagining him as Tarzan and she as Jane (He even had another shirtless scene in the same episode!)
Peter Petrelli and Sylar from Heroes regularly appear in scenes without their shirts on. The tendency to write this in for them is lampshaded in one DVD commentary in which the producers joke about receiving fan mail begging them to keep Milo Ventimiglia naked.
Duncan on Highlander, between the shirtless scenes, flashback great-kilt scenes and two bathtub scenes. In one episode he threatens to get out of the tub. "I can't wait," is the response of the woman who'd burned his dirty old clothes.
Tom Hiddleston as Prince Hal/Henry V in the BBC's Hollow Crown series, particularly Henry IV parts 1 and 2 and Henry V. At various points in the plays he's in tight leather, soaking wet, shirtless (and wet) (and wearing only a towel), in leather trousers that draw attention to his crotch, sexing up a prostitute (not in the original stage directions), and wearing armor so tight it's not a surprise that he was sewn into it by the costume department. The director of Henry V pretty much said that she knew she had a beautiful, beautiful actor and didn't want to waste an inch of him.
Horatio Hornblower: The Mini Series has a lots of sexy scenes with attractive eye candy sailors in nice uniforms, or in various states of undress, and even completely naked. The lead takes the cake, but his mentor and his fellow officers have their fair share of fanservice-y moments.
Horatio Hornblower, portrayed by Ioan Gruffudd, has a lot of shirtless scenes, he swims and dives, and generally gets wet a lot. In "Mutiny", he even has a shower on deck completely naked and we get to see his bum.
Captain Pellew is an older version of Mr Fanservice, but he's a manly man and very hot. He has some shirtless and getting-dressed or getting-undressed scenes.
Archie Kennedy is played by Jamie Bamber who tends to be Mr Fanservice a lot due to his stunning good looks. Archie has many shirtless scenes, but some of them are marred by his being ill or wounded as they really tried to Break the Cutie in the first series. He also tends to get wet.
Mr Bush, played by Paul McGann, has many moments where he is shirtless or almost shirtless, or where he is in wet clothes. Hot stuff.
Hung features Thomas Jane stripping in the opening credits, culminating in him jumping off a dock into a lake. Naked. With his rather nice behind on display.
Hustle has Mickey Bricks and Danny Blue (one of the most hyped episodes of season 3 involved the two of them being dropped off naked in the middle of London, and Danny has been known to strip off for no apparent reason). Also, depending on your tastes, there's Ash "Three Socks" Morgan.
Kamen Rider Double has Kirihiko, who appears nude (in side/behind views) on three occasions. For this reason his Fan Nicknames in Japan are "Shirihiko" or "Ketsuhiko" - shiri and ketsu both being slang for butt.
Legend of the Seeker: Richard is shirtless in the first scene it just goes from there. It sets the tone that their fanservice is equal-opportunity. And with Kahlan and Cara (form-fitting leather, much?), it's a high bar he has to meet. Having the lowest neckline in the party helps.
Kirby Atwood, Nico's lover in Lipstick Jungle, has at least one shirtless scene in almost every episode.
Michael Landon, the creator and star of Little House on the Prairie obviously thought he was providing fanservice judging by how often his character had his shirt off.
Lois & Clark: The New Adventures of Superman: Dean Cain, not just because he was the typical handsome athlete in tights, but also because in some promotional material, he appeared in a white tank top rather than the traditional costume. He and Lois did it a lot, after they got married.
In the pilot Clark answers the door shirtless. Lois is rendered speechless for several beats and her eyes nearly fall out.
Desmond is no slouch in the Fanservice department either. He takes his shirt off seconds after being introduced and gets a Shower Scene shortly after. The first few episodes of season 3 see him running around the jungle naked and even when he eventually finds a shirt he only bothers to do up half the buttons, giving viewers plenty of chances to see his chest.
Sayid, especially after seeing how well he cleaned up in "The Economist". He also tended to favour vests while on the island.
Dyson: cute, sweet, hints at a... complicated past and frequently shirtless.
Kenzi: Now, can we talk about the elephant in the room? And by elephant I mean sexy, sexy wolfman.
Hale. During one episode, he is thrown up on and Kenzi has to take off his vomit-stained shirt. Kenzi is so distracted by his abs she forgets about her disgust. His abs are fantastic though, so it's unsurprising that Kenzi was staring so much.
Man vs. Wild. Bear Grylls. An attractive survival expert goes around in the wilderness and works with his hands and inexplicably takes his clothes off a lot. One episode even revealed that he wears Union Jack undies. There was also that one episode where he had to take off ALL his clothes because they were all soaked. Cue a minute or so of him running around naked trying to get his body warm again. I think the other camera crew were snickering as well.
Simon becomes this in Series 2, following Future!Simon's ID reveal with a Shirtless Scene.
Victor Webster was Mr. Fanservice in Mutant X, where he played a Troubled, but Cute bad boy petty crook whose wardrobe seemed to be mandated at "Sleeveless or Less".
Mike Nelson of Mystery Science Theater 3000. Not only is he arguably the hunkiest of the main cast, he's also the one who appears shirtless most often. Usually as Glen Manning from The Amazing Colossal Man.
Night Man: Handsome, muscular Johnny's trademark outfit while performing sax at his club is a sleeveless black V-neck shirt. Heck, Matt McColm's credit in the opening titles is over a Shirtless Scene, just to leave you in no doubt as to one of the reasons he was cast.
All of the original four male rangers on Mighty Morphin' Power Rangers had the physiques of Greek heroes, and were often seen in tank tops (including in the opening credits) and even occasionally shirtless to show them off. There was, at one point, a shirtless pillow fight between Jason, Billy, and Zack.
Two lion-themed Red Rangers from different subsequent seasons are also good examples of this trope, and they just happen to have the same names as the aforementioned examples from Charmed: Leo from Power Rangers Lost Galaxy and Cole from Power Rangers Wild Force, who both got to show off their surprisingly toy-accurate Heroic Builds through Battle Strips in their respective seasons. In Leo's case, it was such an over-the-top moment (especially given that he morphed five seconds later) that it made it to his character introduction part in the opening credits.
More on Leo: In addition to the famous Battle Strip, there are no fewer than three episodes featuring Leo shirtless and wounded in the Megaship infirmary. Leo also gets three separate introductory shots in the opening credits, and he's wearing less in each one.
He may be 10 years out of his heyday, and overacted to annoying levels, but TommyOliver still got just as many beach scenes as the girls.
Pretty Little Liars: The show probably has a clause in almost any male actor's contract demanding at least one shirtless scene throughout the series.
Keegan Allen portraying Toby Cavanaugh in particular. Shirtless.
Jason (portrayed by Drew Van Acker) who took off his shirt after playing basketball in the park.
The Price Is Right had female models for years until 2012 where the show finally used a male model. The trope is played straight and averted, depending on what the male model wears; the aversion comes from the male model that mostly wears a shirt and tie. Played straight when the male model is shirtless to showcase beach themed items like surfboards.
Rebelde Way: Francisco. He has nice fluffy hair; big, round puppy blue eyes, good abs and a cute smile. It helps he's often shown shirtless and many girls crush on him during the course of the second season.
Riptide: This 80's detective series features copious fanservice from its male leads played by Joe Penny and Perry King, but the most infamous was in the pilot, when the plot contrives to have them engage in a gunfight and then a lengthy car chase ... while wearing nothing but tighty-whities.
Archie from Riverdale is a hot redhead with a six-pack. The show and advertising both make certain that you are aware of this. Archie has his fair share of shirtless scenes as well.
Robin Hood: Richard Armitage. He's sexy no matter what, but in that one he has all the traits: broody bad boy with a sexy voice and all the qualms of a Brad Pitt about losing his shirt for the skimpiest of reasons.
Rome: Marc Antony. We don't know much about his troubled past, but he loves to run around in little (read: no) clothing, and he definitely has the sexy voice. When he's actually wearing clothes, it's often armour. Which women don't really tend to mind.
The "Pit Crew" are a squad of underwear-clad men who help with props (or are the props) for the challenges. They don't say much but they improve the scenery, and the queens are shameless about Eating the Eye Candy the moment Ru says "Oh Pit Crew..."
The queen that's the most conventionally-attractive out of drag is known as the "trade" of the season ("trade" being gay slang for a handsome man). The first time the queens get out of drag, everyone quickly looks around to see who's the cutest in boy-mode.
Salem: John Alden with no shirt, sweaty from chopping wood.
Jake. The bisexual furniture maker who dates both David and Stevie and is into Polyamory is very easy on the eyes and appears shirtless.
Kindly Vet Ted is a case of In-Universe fan service, albeit unknowingly, when it turns out he's been stripping in front of the bunny cam Alexis set up in his office and drawing in a lot of fans who are concerned about whether he will get his pants back on.
Seeing as Sex and the City doesn't exactly need Estrogen Bait, Smith is a purer Mr. Fanservice than anyone on this list. An absurdly beautiful twenty-something hunk who is seen naked many, many times. His nudity in a play he was in was seized upon by Samantha to promote the hell out of it, and he later appeared on a billboard in Times Square with a conveniently placed bottle of Absolut. "My dick is three stories high!"
Soldier Richard Sharpe (Sean Bean) from the TV adaptation Sharpe. He would often take off his shirt. It might look completely gratuitous, but he meant to show his scars he got from flogging.
Sherlock did this mostly by accident in the first season, when Benedict Cumberbatch impressed with the way he twirled his coat. In the second season, though, the show was definitely aware of the effect the actor and the coat had on the viewers, considering all the talk about cheekbones and acting mysterious. And naturally the fandom rejoiced about Sherlock visiting Buckingham Palace in nothing more than a sheet, which he nearly loses for good during the scene.
Smallville: In the very first episode, Clark is stripped to his underwear, tied to a symbolic cross, painted with a giant S on his chest, and left to hang there, sweating and helpless due to the Kryptonite around his neck. The very first episode. It's also the image on the First Season box cover.
Jax from Sons of Anarchy is frequently naked, much to the delight of female viewers.
Juice from Sons of Anarchy is also a good example, particularly in the latter half of the series. Where he has plenty of scenes where hes shirtless or naked. Noticabily, his first scene in series 7 involves him doing pushups in the nude for no real reason.
Spartacus. Good lord, Spartacus. Just about every gladiator introduced, including the title character, has some appeal. For the most part, they're all muscular and bronzed, never wear shirts (or pants), and sometimes are shown in the nude, with everything on display.
Trip took his shirt off enough times to count for this. Trip is reduced to his undershirt and underwear on three separate occasions in Season 1 alone. He even spends half of one episode saving the day wearing this under combo. Whenever he (or any other male character, for that matter, but Trip especially) used the decontamination chamber, cue shirtless gel-lathered muscle rubbing scenes.
Star Trek: Picard: Cristóbal Rios' introduction is a Shirtless Scene, and his gaudy outfit on Freecloud includes a deep V-neck which, strictly speaking, is not necessary for a flamboyant 'facer, but it's obviously there to provide some eye candy.
Strike Back features quite a bit of male nudity. Given that it's on Cinemax, this is probably to be expected.
Billy Hargrove Stranger Things is a muscly handsome, long haired, mustached young man, whom every grown woman (aside from Nancy and Joyce) is attracted too. He's also a Jerk Jock, bourderline psychotic and he has extremly screwed up life due his Missing Mom and abusive dad. Fittiingly he's a lifeguard in Season 3.
Ryan Shay from Suburgatory. He has had so many fanservice-y scenes that not even Tessa, who doesn't like dumb guys, could resist.
Brothers Sam and Dean Winchester fight the forces of evil, and even (especially) when sweaty and bloody, they're smoking hot. There have been numerous shirtless scenes and a few towel scenes. Sam, in particular, is built like a brick house.
Stubble-jawed, deep-voiced, blue-eyed shirtless Pretty Boy angel Castiel.
Oddly enough, for how long the series is, the male leads don't really take off their clothes onscreen that often, and are more often than not wearing around three layers. This had led to fangirls ogling them in an almost Victorian manner, creating gifsets and screencap galleries on Tumblr of their hands or necks, admiring the way their butts look in (not-skinny) jeans, and swooning over the way they fill out a shirt, or their forearms when they roll up their sleeves.
The TV remake of Teen Wolf: While not being the most critically-acclaimed show in the world, it has succeeded above and beyond in the eye candy stakes. The entire male cast is gorgeous, and werewolf or human, there are multiple shirtless scenes in every episode.
Tyler Hoechlin, who plays the dark and brooding Derek, has a body that has to be seen to be believed. The great thing is, the production crew seems to know this, given he works out shirtless at least once an episode. At least. Lampshaded in one episode in which Stiles bribes Danny into hacking a computer system using Derek's body. Derek knows it, he's pissed about it, does it anyway.
Stiles in early seasons was no go. The show runners knew the fans were thirsty for Stiles but steadfastly refused to show the goods. In one episode Stiles started taking his shirt off only for Scott to open his locker door, blocking the view. By the time the door closed Stiles had finished changing. Subverted.
Tyler Posey plays the titular teen wolf, Scott, and gets to be near-naked, a lot.
Colton Haynes is the Jerk Jock Jackson. He's not a werewolf until season 2, at least, but there seem to be a lot of scenes of him changing in locker rooms.
The scene in Season 2 when Derek hallucinates himself naked in the big empty white space for no apparent reason? It was literally added because Tyler Hoechlin had bulked up for the second season and he was surprised he didn't have any shirtless scenes.
Theo played by Cody Christian in Season 5 does this in universe on purpose as he's working out with his shirt on, hears Malia coming, smirks and very deliberately takes his shirt off and continues working out aka flexing in front of her. This backfires as Malia is a super strong were-coyote who could care less how strong he is and makes that very clear by casually grabbing his weights and holding them effortlessly. That being said she was enjoying the show as were we all.
Jordan Parrish the new deputy and resident hellhound burns through shirts regularly.
For those who prefer older men there was also Peter Hale (who does get shirtless and give his nephew Derek a run for his money), Chris Argent, resident DILF and his form fitting henleys, as well as Sheriff Stilinski constantly in his uniform yet another DILF.
Jason, the very athletic, insanely pretty, endearingly good-hearted, a bit insecure, and often-naked (thank you) Good Ol' boy.
Season Three hit the ground running! In the opener alone, we had shirtlessHo Yay with Sam and Bill which turned out to be an Erotic Dream on Sam's part, more naked Jason, and more naked Eric. We're clearly being spoiled now.
Alcide, the series resident sexy, sexy wolfman. He goes to a wake and the female mourners are completely Distracted by the Sexy.
The Tudors. Jonathan Rhys-Meyers. Shirtless scenes a-plenty! Of course, he's not the only one in the male half of the cast who's hot.
Even highbrow drama The West Wing got in on the act. All of the listed characters lost their shirt more than once for absolutely no plot-related purpose whatsoever. Women had a lot of reasons to watch this show.
Bradley Whitford as Josh Lyman◊ developed an incredibly devoted fanbase.
Jimmy Smits as Presidential candidate Matt Santos◊ in the final two seasons.
White Christmas: Kang Mi Reu introduces himself coming out of the shower wearing only a small pair of underwear and showing off his built physique. When the boys are all having fun in the snow, he takes his shirt off first and is the longest to go around shirtless.
White Collar: The stunningly gorgeous Neal Caffrey (played by Matthew Bomer). He breaks out of prison to look for his disappeared and possibly double-crossing girlfriend (troubled past, "bad boy"), flirts with every woman he meets, and has been known to study law books shirtless (incidentally, his impeccable taste in everything makes him look good no matter what he is or isn't wearing). He also likes sculpting and painting wearing nothing more than a pair of sweatpants.
Fox Mulder. He's got it all, the tragic backstory, the sexy voice, and the smokin' hot body. The Trope Namer for Estrogen Brigade Bait was the David Duchovny Estrogen Brigade from alt.tv.x-files. Mulder's an especially noteworthy example because unusually for an American show that wasn't particularly aimed at a female audience, Mulder spent a lot more time not fully clothed than Scully did.
Assistant Director Walter Skinner got a few gratuitous shirtless scenes. He had quite a few fans.