"When you haven't been getting any, other people notice that. Other people pick up on that. You yourself don't know that you haven't been getting any; you just think, oh, another week has gone by. ... But on the other hand, when I haven't been getting any and then I get some, overnight I become a different person. ...Next day you wake up, you're Mahatma Gandhi. You're full of love. You're a visionary. You care about world peace. I have a smile for everyone. 'Why yes, I'd love a Street Sheet! In fact I'll take all that you have! Keep the spare change! Why yes, I am getting some!'"
— Marga Gomez
A character not known for their sexual prowess comes into work/school/library/other location in a great mood, possibly dancing, singing, maybe some skipping or depending on the character even a pelvic thrust or a Freudian Slip, with a broad grin on their face. Other characters comment how "you're in a good mood" and then somebody asks "you had sex, didn't you?" (Alternatively, they'll go through the Did You Get a New Haircut? routine.)
Normally used on characters that are a bit grumpy or disillusioned proving that all they needed was to get laid. It's almost always a male, as the female equivalent is more subdued.
Compare to Virgin Vision, where another person can tell a character has had sex without any clues being given off, and Virginity Flag, where there is a blatantly obvious sign of the loss of virginity.
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Anime & Manga
Gundam 00: Chaste Hero Setsuna asks his teammate Lockon "what are Allelujah and Sumeragi doing next door?" in the CD drama.
Eda in Black Lagoon has asked this to Revy more than once. Needless to say, each time she does, Revy is not amused.
In Junjou Romantica, Miyagi teases his collegue Hiroki about this a few times, once just to watch him squirm.
Bakemonogatari: Araragi is seen in what one might call an exuberant and joyful mood. It's difficult to confirm that anything really did happen the previous night, but he does seem awfully happy.
Implied in Ergo Proxy. After a certain point in the plot Vincent and Re-l act a lot nicer to each other. This is never explained.
School Days: While never asked, Taisuke has this expression in a certain episode. This being School Days, that's because the night before, he indeed had sex, or rather, forced himself on Kotonoha while she was shocked at knowing that Makoto chose Sekai for his Folk Dance partner. She coldly dismissed him the day after and Taisuke is none the wiser that what he had done is basically rape. Did we say this anime is a Dysfunction Junction?
Gravitation: Played with/inverted. The night after Shuichi first has sex with Yuki, he walks around with glowing eyes and an enormous smile, asks his best friend to ask him what happened last night, and then won't specify.
In Astonishing X-Men, after Kitty Pryde and Peter "Colossus" Rasputin finally consummated their relationship, they go to the kitchen together in high spirits, only to be surprised by the presence of Kitty's Big Brother Mentor Wolverine. Logan simply looks back and forth between them and says "'Bout time." Logan has super smell among his Super Senses and almost certainly caught the whiff of afterglow.
A Superman story from the 1970s, Who Took the Super out of Superman has Lois Lane visiting Clark Kent's apartment and cooking him a beef bourguignon dinner, before having a romantic night together. Lois goes into work at the Daily Planet the next morning and a coworker, Steve Lombard, notices her acting unusually. It's ultimately ambiguous whether or not Clark and Lois actually did sleep together. The Superman fandom has turned beef bourguignon into something of an in-joke. Occasionally, beef bourguignon will also appear as a Mythology Gag.
In a Code Geass fanfic In the End, Lelouch is in a really good mood after losing his virginity to C2.
HK-47:Extrapolation, Master: The commander meatbag exited your bunkroom with a smile on his face, and you are presently unclothed, your body temperature is higher than normal, and your facial read-out falls in the range termed as 'flushed.' Do you require some post-coital refreshment?
In One Thing Leads to Another, Robin and Starfire come to the common room after their first time. Among their teammates, one is an empath, the other is a shapeshifter with an enhanced sense of smell. They are quick to do the math.
Subverted in the Gurren Lagann fanfic The Spiral Path. Everyone assumes this with Rossiu and Kinon, but the author notes go out of their way to point out that there wasn't any sex.
Happens frequently in Teen Wolf fics. Because in Canon, werewolves have a much better sense of smell than regular humans, most fans agree that they would presumably be able to tell that someone has recently had sex by scent alone.
In the Homestuck fanfic Like Lovers Do Aradia manages to not only tell that Eridan and Feferi have pailed, but also to convey her smugness about it without saying anything in particular.
In Ten Inch Hero Jen, who is a virgin, masturbates for the first time. Later:
Priestly: Hey, Jen, did you do something different with your hair?
Jen: No, why?
Priestly: I don't know. You just look different.
In Turner and Hooch, when the normally uptight Turner tells his workmate to relax, the workmate suddenly proclaims, "You humped the vet!"
In Sliver: "You have been fucking your brains out!"
In The Specials, Deadly Girl is a bit more upbeat than usual and Minute Man is looking a little more relaxed. Ms. Indestructable takes one look at them and blurts out "Did you two sleep together?!" Deadly Girl wryly asks if oral sex counts, then cheerfully announces "Doughnuts for everyone!"
Friday: Not that it's any of your business, Mr. National Enquirer, but I had the pleasure of spending a quiet evening in the company of Connie Swail.
Streebeck: Wait a minute. "Connie Swail?" Don't you mean "the virgin Connie Swail"?
[Friday merely turns his head and looks at Streebeck, accompanied with a *BUM-BA-DUM-BUM!* ]
A couple times in Mallrats, other characters comment that Brodie is "glowing" shortly after he had elevator sex.
In Starfighters of Adumar, Wedge, the leader and responsible type of Red Flight, reconciles with his old love interest Iella Wesseri. The next morning he is exuberant, a little flighty, and joking readily, while his Wing Man, who normally is the one with all those traits but spent the night on the balcony watching for attackers, is grumpy. It's never said outright, but the scenes do imply that Wedge and Iella had sex, and Wes almost-but-doesn't-quite ask him.
In Alex Sanchez's Rainbow Road: "You two sure are smiley today. Did you finally bone last night?"
After a night with Morelli in Four to Score, Stephanie Plum has to deal with Connie, Lula, Vinnie, and Ranger all commenting on her suddenly active sex life as soon as she's in the same room with them (and she didn't tell any of them).
Paul Robinson's Instrument of God: Supervisor 246 recounts his first time with a woman as another teenager shows up. "‘Look, I'd better go,' I said, and I tried to walk past him. Well, I guess her boyfriend could smell it on me, because he said, ‘Did you just fuck her?' I probably should have just lied, and said ‘no,' then left. ‘Yeah,' I said."
In Tom Clancy's Clear and Present Danger, the FBI director's secretary starts a relationship with a drug lord's intelligence agent and when she goes to work the next day, her coworkers notice she has "a sparkle in her eye that could not be hidden."
Honor Harrington: After Honor sleeps with Paul Tankersely, her admiral notes that "dinner agreed with her".
In The Pursuit of Happyness, by Douglas Kennedy, Sara's brother Eric knows that she slept with Jack, the guy she met at Eric's party.
In one of the Alien Nation books, Sykes tries to have sex with an alien, leaving him with bruises on his neck from her legs; the aliens become very "uninhibited". While humans generally don't know enough about Tenctonese physiology to figure out what happened to him, his coworker is an alien too. He rehearses lying to cover it up. The moment he enters the workplace, another alien says "did you copulate with a Tenctonese last night?" Sputtering, he tries to run off, with the alien shouting behind him "sexual ignorance is dangerous!" Meeting his coworker only leads to more awkwardness (as his coworker knows his alien girlfriend). An almost identical scene, following almost identical events the night before, occurs in the TV series.
The Sound and the Fury is this trope played seriously. Caddy's loss of her virginity is an obsession within the Compson family, with each of the members having a different reaction to it. Her special needs brother Benjy can even smell that something's changed about her after her first time.
Song at Dawn: Everyone can tell that Dragonetz and Estela have had sex because their love ballads are suddenly much better.
A more subtle example in The Lost Fleet. After the first time Victoria Rione seduces John Geary, both of them come to the Dauntless's bridge, where Captain Tanya Desjani takes one look at them and instantly figures it out, despite Geary trying to act normal, and Rione being a politician (i.e. can easily fake any expression). Desjani makes a suggestive comment and leaves the bridge. Dumbstruck, Geary mouths "How?" to Rione resulting in a "need to know" speech, which Geary interprets as Women's Mysteries.
Live Action TV
Buffy the Vampire Slayer: Xander does this to himself in the middle of a very weird night. The best part is that no one else figures it out.
This happens a couple of times between Angel and Wesley in Angel. In in a season 2 episode, Angel remarks that Wesley had sex with a blonde the night before. In season 4, during his Angelus turn, Angel mentions in front of the whole gang that Wesley has been having sex with Lilah.
In Just Shoot Me! Finch comes into work after sleeping with his supermodel girlfriend and somebody comments, "Wow, the only time I've seen you this happy is two years ago whe—you had sex, didn't you?"
In another episode, Nina claims that Maya has sex every twelve months, which is how she knows to set the clocks back for Daylight Savings Time.
There's only one day of the year when Dr. Bob Kelso's in a good mood (the day after his wedding anniversary) so people only ask him for anything once a year. This actually turns out to be a subversion: his wife always spends the anniversary at "fat camp". Kelso, however, allows the myth to continue so people only ask him for things once a year.
Another subversion where JD has trouble getting it up and walks into work thinking everyone is doing this when they're not:
Dr. Cox: Hey, Newbie, what's up?
J.D.: Everything! Everything's up!
Dr. Kelso: Rise and shine, sport!
J.D.'s narration: What, did someone send out a flier?!
Todd: Hey, J.D.! How's your penis?
J.D.'s narration: All right, calm down, he says that to everyone.
Another example is Turk, who demonstrates an uncanny ability to always know when two people have had sex. He deduces J.D. and Elliot's hook-up solely on how they exchanged nods at work. He then points out two male orderlies who he claims have started dating, and he's quickly proven right. In J.D.'s case, explained by the sex gongs they bought each other. Except, of course, when JD moves out and Turk still hears it...
Turk: "Yeah, buddy!"
A great example is when Dr Cox starts dating pharmaceutical rep Julie (played by Heather Locklear) in season two. He goes from surly Cox to carrying Julie piggyback singing "Perry's gonna get some loving!" while she smacks his ass. He even winks at J.D.
Turk learns about Denise's and Drew's relationship from Todd, who's apparent super-pervert skills allow him to detect any sex in the hospital, their position, and what clothes they are/aren't wearing.
"Why won't you let him take off his pants?"
In Frasier the incredibly uptight Niles was oddly chipper — when someone called him on this, he responded with I Have Just One Thing to Say: "I find that comment boorish and offensive and... impossible to deny!"
In season three of Glee after Will Schuester and Emma Pillsbury finallyhave sex ( after the New Directions finally win at Nationals) Sue sees her the next day and quips "Why do you look different?"
Friends: In "The One With Phoebe's Husband", Ross was dancing down the street and was called out on it by an old lady: "Well, somebody got some last night". He gleefully shouts back "twice!"
In the pilot, Monica has just been with Paul the Wine Guy, and her co-worker calls her on why she's smiling all the time. As Rachel said earlier, "It looks like you slept with a hanger in your mouth!"
In "The One After Ross Says Rachel" when Phoebe sees Chandler and Monica for the first time since their trip to London, where the two hooked up, she immediately yells out "You had sex!" to which the two start sputtering and trying to deny it. Phoebe says to Chandler, "Well, obviously not YOU. I meant Monica." Monica then denies it as well. In a rare subversion, Phoebe accepts this, saying "Man, this pregnancy's throwing me all off."
An episode of Will and Grace had two characters do this to Grace, with one actually able to identify the other man with this too. Both cases are a simple "You had sex!"
In That 70s Show, the day after Eric and Donna have first made love, a weirded-out Donna appears from Jackie's point of view to have the words "I had sex" on her forehead. Eric, on the other hand, had the words "Guilty" written on his forehead when talking to Donna's father.
In Night Court, the day after Christine gets charmed by a young artist she successfully defended, she shows up smiling as usual. Resident lecher Dan takes one look at her and declares "You bopped the kid!".
In Who's the Boss?, Tony runs into Mona after he's had a "successful" date. Mona nonchalantly busts him.
"Endgame" has Tony doing this when McGee walks into the office extremely happy. Tony refers to it as "Pulling a Heston" in a reference to Planet of the Apes.
Ziva does it to Tony once as well — gleefully. "It's okay to admit it, we're all adults here!" Of course, Fornell is behind her: "That's a subject I'd be willing to debate, Officer David."
Life: Crews got the picture when he and Reese are on their way to the desert, and a song's playing on the radio, and Reese is humming along without realizing. Crews quips, "You were humming," Reese goes, "What? No I wasn't," and Crews goes, "When people hum without realizing, it usually means they're... happy." To which Reese replies, "I wasn't humming, and I'm not happy!"
What really blows her cover is when their boss calls the hotel room the two are staying in, and immediately starts talking dirty over the phone having assumed they had separate rooms and that Reese would answer.
Rather a sad example in Gilmore Girls. Lorelai comes home and sees Rory and the very married Dean stumble out of Rory's bedroom looking dishevelled and a little too happy. The anger and disppointment on Lorelai's face is heartbreaking.
In season two of House the team has gathered in the middle of the night and wonder what is taking House so long. They know he left with Stacey, but Cameron is sure that they didn't have sex (while Foreman hopes they did, since it might put House in a better mood). Enter House, singing and smiling. Played with, as House was not happy about the sex itself (he hires prostitutes from time to time, so...), but because he still had feelings for Stacy.
It gets better: Word Of God says she was supposed to hum the MacGyver theme tune to surprise Richard Dean Anderson, but no one could remember it, and asking him would've spoiled the surprise.
Then there's a scene in the episode "Crossroads" involving Teal'c, of all people. An old flame has come to the SGC to get help. They are shown kissing in her room. Cut to Teal'c leaving the room grinning from ear to ear as Daniel walks up.
One episode of 7th Heaven features Annie and Lucy sharing knowing glances over (I think) ice cream after they'd both gotten some.
In season two of Veronica Mars, immediately after Veronica sleeps with Duncan she bumps into Logan who says she looks different and asks if she's changed her hair. At home her father makes a similar comment and she wonders whether he's really such a good detective that he can tell she's had sex.
Averted in Degrassi: The Next Generation: J.T. keeps bragging about his and Liberty's sex life, but Toby doesn't want to hear anything else about it. Then Liberty dumps pop all over J.T.
Happens to C.C. and Niles in The Nanny. Niles enters singing and C.C., normally an Enemy to All Living Things, is gets a scene where she is sweet, sings like it's the sound of music, and a dove lands in her outstretched hand.
Played Straight in Bones, Season II, Episode 14 'The Man in the Mansion.' Bones comes into work looking 'very happy,' and Angela instantly knows she's had sex with Sulley.
Chief Johnson in The Closer gets very cheerful when she gets some.
Though he really tries to hide it, Beckett can tell every time Castle has slept with Ellie Munroe.
In the second episode of season five, Lanie can immediately tell that something is different about Beckett on her first day back to work, and eventually works out that it's because she's having regular sex. This causes Beckett a certain amount of fluster because she's trying to keep the fact that she and Castle have started a relationship secret from everyone.
Happens offscreen on Party of Five. Nina was immediately able to tell that Julia was no longer a virgin.
Subverted in Sliders where it is actually Wade's disheveled and decidedly un-chipper appearance and demeanor that cause Quinn to say "Did you get lucky or run over?" Neither; she'd been partying with vampires who were trying to change her.
After spending the whole film/web-series longing after Dr. Kelly in Battlestar Galactica Blood And Chrome, Adama finally gets to do her after talking about her dead husband and how the war-machine lied about this death in order to boost enrollments. Shortly after he finds Coker playing on a piano and takes a swing of expensive wine with a wide smile on his face.
The Lonely Island just had sex, and the video is made of this trope. With TV broadcast and fireworks. Seriously, look at Akon's face whenever he's on-camera.
Knights of the Old Republic 2: Given that the result of getting enough light side points is a sort of healthy glow, Mira invokes this by commenting that she thought the player and whichever potential love interest he/she has a higher Influence with "hooked up a power coupling".
Subverted in a later strip where nobody can identify Rayne's "I just had sex with a midget hooker" face (though in their defense, said face looks like he's having a stroke or something).
Several times in Dominic Deegan. Most notably, when Greg and Pam do it for the first time, Dominic figures it out because, as he points out, some people have a "glow" about them after their first time, but because Greg is a powerful White Mage, in his case, it's a little more literal.
Narbonic: Mell and Artie come back from a mission to find Helen and Dave very disheveled and the lab a mess. When Artie asks about the mess, they claim a "series of lab accidents"; Mell just says "I can't believe you guys finally goinked."
When Mell explains to Artie: "I mean, check him out, he's wearing the red shirt ... ." "The shirt is significant" "It's his best shirt, and it's always Thursday in the rotation. He moved it up to Monday. Plus he cleaned his glasses." "From this you deduced he's had sex?" "No, I knew he had sex 'cause he's smiling. I'm just trying to educate you"
Out There: The insightful Miriam concludes that Sherry has broken her long dry spell upon observing the latter's visible discomfort with discussing the topic ; James makes a lucky guess based on a similar observation , and Clayton explains the most compelling reason she's unable to conceal what everybody else can see .
Time Squad In "Ex Marks the Spot," Larry suddenly acts cheerful and more accommodating around Tuddrussel. Otto even questions why Larry is so cheerful. The sudden change in mood was handwaved as Larry finally giving up being snarky and being nicer, but given the suggestive imagery in Larry preparing Tuddrussell's meal (i.e., the gravy being pumped inside a turkey to the point of near bursting and a lone cherry sinking into the turkey), it had to be something more.
In Family Guy Brian is able to instantly tell when Stewie had walked in on Peter and Lois having sex.