History Main / DidYouJustHaveSex

* ''VideoGame/TheLegendOfHeroesTrailsFromZeroAndTrailsToAzure'': Lloyd having an intimate but platonic evening with Elie causes the rest of the Special Support Section to assume they did the dead after seeing how close they are and mock them. This continues as a SustainedMisunderstanding, with Lloyd's aunty reacting to his changed demeanor by telling him that he's finally "become a man" like his older brother.

* ''Fanfic/IAmNotGoingThroughPubertyAgain'': Temari and Kankuro stumble across Sasuke and Sakura sitting together in an unused room of the tower at the center of the Forest of Death after they had just completed a three day sexual marathon via Tsukiyomi. Even though the two Konoha shinobis aren't mussed at all, the two Sand Siblings can clearly tell that ''something'' just happened between them based on their flushed and satisfied appearances.

--> '''Eleya:''' What?\\

* In the ''{{WebComic/Homestuck}}'' fanfic ''[[http://archiveofourown.org/works/710801?view_adult=true&view_full_work=true 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.

* ''Series/Batwoman2019'': In "Grinning From Ear To Ear", both Mary Hamilton-Kane and Luke Fox mistake the spring in Sophie Moore and Kate Kane's steps for a sign that they had sex the previous night. It was just [[BigDamnKiss really good kissing]]. Luke pours cold water on Kate's joy by pointing out that Batwoman having a relationship [[TheMasqueradeWillKillYourDatingLife can only cause trouble]].

* ''WesternAnimation/InsideJob2021'': Reagan's new upbeat, supportive attitude despite [[spoiler:her father being in control of Cognito]], as well as stating that she has a form of emotional release, makes it pretty clear to the rest of the department that Reagan's been getting laid, to their mutual relief.

* ''Webcomic/BooItsSex'' Tara claims that sensing this is one of her "ghost powers," but she might have been joking and can tell just because she has [[ReallyGetsAround a lot of experience.]]

* ''Series/{{Castle}}'':

* ''VideoGame/TheLegendOfHeroesTrailsFromZeroAndTrailsToAzure'': Lloyd having an intimate but platonic evening with Elie causes the rest of the Special Support Section to make this assumption after seeing how close they are, and mock them. This continues as a SustainedMisunderstanding, with Lloyd's aunty reacting to his changed demenour by telling him that he's finally "become a man" like his older brother.

* ''Series/Batwoman2019''. In "Grinning From Ear To Ear", both Mary Hamilton-Kane and Luke Fox mistake the spring in Sophie Moore and Kate Kane's steps for a sign that they had sex the previous night. It was just [[BigDamnKiss really good kissing]]. Luke pours cold water on Kate's joy by pointing out that Batwoman having a relationship [[TheMasqueradeWillKillYourDatingLife can only cause trouble]].

** ''Series/{{Angel}}''

--->'''Lorne:''' Jeez, keep your pants on! (Angel enters) Well, I see we're a little late with ''that'' advice.

* ''WesternAnimation/StarshipTroopersInvasion''. Whistles and catcalls ensue from the other MI troopers when Bugspray and Trig turn up conspicuously last for the MissionBriefing.
* ''WesternAnimation/TimeSquad'' In "[[Recap/TimeSquadS02Ep19ExMarksTheSpot 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.

* ''Anime/MobileSuitGundam00'': ChasteHero Setsuna asks his teammate Lockon "what are Allelujah and Sumeragi doing next door?" in the drama CD.
* In ''Manga/JunjouRomantica'', Miyagi teases his collegue Hiroki about this a few times, once just to watch him squirm.

* ''VisualNovel/SchoolDays'': 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, [[spoiler: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 mention this anime is a DysfunctionJunction?

* During the first flashback arc in ''Manhwa/CavalierOfTheAbyss'', Jae Hyuk is seen passionately kissing Serin on top of a bed. The next morning he's incredibly cheerful, even commenting about how great the weather is in the middle of a thunderstorm, leading to his LivingWeapon‎ Diffor, who had a crush on him, to call him out on this.
* In ''Anime/OuranHighschoolHostClub'', the hosts walk in on Tamaki and Haruhi while Tamaki is helping her with her fear of thunderstorms. At the moment, he's putting a blindfold and headphones on her to assure that she won't hear or see anything. Needless to say, they assume that it's [[DoesThisRemindYouofAnything something else]].
* In ''Manga/NatsuENoTobira'', [[ThoseTwoGuys Jack and Linds]] end up finding out about [[spoiler: Marion losing his virginity to Sara]] when they go to her house to see if he's around and... find their friend [[ShirtlessScene only in a towel there.]]
* ''Literature/{{Shimoneta}}'': Zigzagged in chapter 10, when Ayame walks in on Tanukichi and Oboro in the girls' locker-room and sees Tanukichi has pinned Oboro on the floor. Then sees Oboro is breathing heavy and smiling with a faint blush from just having [[spoiler: [[TheModestOrgasm his first orgasm]]]]. Ayame doesn't say a word, but [[NotWhatItLooksLike clearly thinks]] [[SorryToInterrupt she's interrupting]][[note]]What really happened: Oboro is a guy who [[DudeLooksLikeALady looks]] ''[[CrossdressingVoices and sounds]]'' like a darkhaired girl. Tanukichi had set a trap for Gathered Fabric and mistook Oboro for one of them, because the room was dark. So he wrestled him to the floor to capture him, but didn't realize his mistake until the lights came back on. However, Tanukichi realized his foot was pressed against Oboro's crotch, which when it dawns on him that Oboro is actually a male, but he [[CrotchGrabSexCheck double checks to be sure]] and inadvertently causes Oboro to [[TheModestOrgasm get off from it]], which is when Ayame walked in. She sees Oboro disheveled on the floor with Taukichi holding [[LonghairedPrettyboy "her"]] legs open and her panties were [[JizzedInMyPants visibly wet]], so Ayame assumes Oboro and Taukichi had just finished having sex[[/note]] so she ducks back outside and slams the door behind her.

* In ''Anime/RevolutionaryGirlUtena'', while they don't confront her directly, Miki and Juri converse amongst themselves about this after [[spoiler: Utena has sex with Akio]], noticing how much more girly she's been acting.
* ''Literature/RebuildWorld'': When the protagonist's [[TheSquad Squad]] of PrivateMilitaryContractors (known as "Hunters") take an hour of R&R from their medevac operation, the OldSoldier Shirakabe gets shoved into the back of his APC by the HeroicSeductress Carol, so she can sleep with him for information after he repairs and restocks the vehicle. Since Shirakabe is known for being early, him meeting the rest of the squad exactly on time afterwards alongside Carol, leads to an awkward exchange with everyone else staring at him because they could figure out what happened.

* In ''Astonishing Comicbook/XMen'', 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 BigBrotherMentor Wolverine. Logan simply looks back and forth between them and says "'Bout time." Logan has [[TheNoseKnows super smell]] among his SuperSenses and almost certainly caught the whiff of afterglow.

* In a ''Franchise/CodeGeass'' fanfic ''[[http://www.fanfiction.net/s/6969408/15/In_the_End In the End]]'', Lelouch is in a really good mood after losing his virginity to C2.

* Athena Prime had a ''VideoGame/KnightsOfTheOldRepublic'' [[http://www.kotorfanmedia.net/node/23 fanfic]] where ''HK-47'' pulls this trope in regards to Revan and Carth.

* In [[http://www.fanfiction.net/s/3362802/1/One_Thing_Leads_to_Another 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 ''Anime/TengenToppaGurrenLagann'' fanfic ''[[http://www.fanfiction.net/s/8085240/2/The_Spiral_Path 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.

* In chapter three of ''Fanfic/BaitAndSwitchSTO'' Captain Kanril Eleya strolls onto the bridge after having a one night stand while ashore at Deep Space 9. Her first officer spots it immediately and gives her a look.
--> '''Eleya:''' What?\\
'''Tess Phohl:''' What do you mean, ‘what,’ Eleya? You walk in here looking like a [[HoldYourHippogriffs grayth that just dined on prize alicorn]] and expect nobody to notice?

* In ''Fanfic/EmpathTheLuckiestSmurf'', Duncan [=McSmurf=] is able to tell through [[TheNoseKnows his sense of smell]] whether a fellow Smurf just had [[NocturnalEmission "the Smurfette dream."]] This pops up in a few mini-stories that take place after Empath and Smurfette marry as well as their fellow male Smurfs, when Duncan detects with his nose when they just had sex.
* ''Fanfic/DoingItRightThisTime'': In Chapter 3, Ritsuko is looking ridiculously cheerful and sporting a huge hickey. Misato tries to work up the nerve to ask the obvious question... [[spoiler:And then Maya walks into the room sporting a ''collar'', which answers questions Misato didn't want to ask.]]
* In chapter 8 of ''Fanfic/AdviceAndTrust'' Rei manages to piece together that Shinji and Asuka were just having sex in a supply closet based on how they smelled, their lack of tension, and the fact that they arrived back at the classroom at the same time even though they left separately. By extension, she's able to figure out that they've been in a SecretRelationship for the past few months (something that nobody else noticed) even though she had less than a month of experience with recognizing social cues.
* ''Fanfic/ACrownOfStars'': In chapter 44, when Daniel greets Shinji and Asuka he notes that they seem very pleased and asks if they got any sleep the last night. Shortly after Ching asks Asuka how good Shinji was. When Asuka asks if they are so obvious, Ching replies that they're practically ''glowing''.
-->'''Daniel:''' And you two seem like you passed a very pleasant night. Get any sleep?\\
'''Asuka:''' (thinking) 'Oh Gott, is it written all over my face or something?'
* Victoria, in the ''VideoGame/DragonAgeInquisition'' fanfic ''[[Fanfic/TwiceUponAnAge All This Sh*t is Twice as Weird]]'', knows that Mahanon is setting up his GrandRomanticGesture for Cassandra. When she wakes in the morning and finds that his bed wasn't slept in, she figures out what happened; when he comes back to the room a little while later, she proceeds to razz him as only an honorary little sister can.
-->'''Victoria:''' (''sing-song voice'') Someone never came to be-ed...
* Alluded to in ''FanFic/TheApprenticeTheStudentAndTheCharlatan''. Trixie's first appearance sees her teasing Twilight over apparently getting laid with Nova, due to the fact that she seems like she's in a lot better mood than usual that particular morning, [[LongingLook not to mention the way she was looking at him]], though it turns out it's just because it's the first proper night of sleep she's had in months.

* ''Fanfic/CreateYourOwnFate'': Eleya's conversation with K'Ragh briefly turns to discussing their respective love lives, shortly after she's started dating Reshek Gaarra. After commenting on his latest divorce, K'Ragh remarks, "You look like you've found a nice gentleman. There's that glow I haven't seen for a while." Eleya fibs, blaming the subspace connection.
* ''Fanfic/FateHaremAntics'': When Taiga sees Shirou coming out of Sakura's room in the morning, it doesn't take her long to realize they spent the night together. She pulls out a bamboo sword and prepares to "administer punishment" for Shirou stealing Sakura's innocence. When Sakura explains that [[CovertPervert it was all her idea]], Taiga pauses for a moment, [[InelegantBlubbering then starts bawling]].
-->'''Taiga:''' Sakura took Shirou's innocence! A woman I let in the house stole Shirou's virginity! I'm a bad guardian!
* ''Fanfic/TalesOfTheOtherverse'': At the end of the fifth chapter, [[ComicBook/SheHulk Jennifer Walters]] runs into ComicBook/{{Rogue}} singing and fixing breakfast while [[ComicBook/{{Supergirl}} Kara]] is acting unusually perky. Jennifer easily puts two and two together and gives congratulations to both women.
-->She spun to see an equally cheery Kara bearing down on her, her arms full of printouts. Like Rogue, she was still dressed in her nightclothes. She stepped aside and watched as Kara zipped by to plop her burden on the table. Then she saw the unexpected. Kara had gone straight to the coffee pot, and stopped long enough to quickly kiss Rogue. And, despite its quickness, there was nothing chaste about the kiss. Jenny had no doubt she had just witnessed a kiss between lovers.\\
"Well, I'm glad someone got laid last night!" She drawled, leaning in the doorway.
* Hilariously subverted in ''Fanfic/HarryAndTheShipgirls''. The night after finally getting a boyfriend in Captain Sousuke Yonehara, Ashigara was extremely cheerful when greeting her sisters the next morning. [[EntertaininglyWrong They came to the conclusion that she had been drugged.]]
* In the ''Franchise/CodeGeass'' fanfic ''Fanfic/CodeGeassThePreparedRebellion'' Milly is easily able to tell that Sayoko and C.C. have been with Lelouch, though the narration doesn't mention how she knows.
* As Harry is walking dazed after Tonks kisses him in ''Fanfic/TheAwakeningOfAMagus'', Remus says he can tell nothing more than a kiss happened, thanks to his improved senses. Then Sirius realizes this means he could tell whenever someone was fooling around at school...
* The ''WesternAnimation/StarWarsRebels'' fanfic ''[[https://archiveofourown.org/works/28572327/chapters/70023663 Rain/Fall]]'': The morning after Hera and Kanan are busy having a "meeting" alone on the ship, everyone is very annoyed about how chipper the pair are. Everyone is so distracted, in fact, that it takes a while before anyone notices how strange Sabine and Ezra are acting and how their subtle not-quite flirting has turned into actual arguments laden with sexual innuendo.
* ''Fanfic/GuysBeingDudes'': Sierra can't tell if [[VideoGame/PokemonGo Spark and Arlo]] did, seeing as Arlo always has some degree of warranted swagger and they both tend to have MessyHair and otherwise disheveled looks.

* ''Film/EveryWhichWayButLoose'': Slowly pieced together by the main character's sidekick. Initially, he thinks their literal TeamPet just mated.
* The Brazilian movie ''Film/AMulherInvisivel'' has a line that goes like "You're too happy. Are you screwing someone?". He... [[ImaginaryFriend kinda is.]]

* In ''Film/{{Sliver}}'': "You ''have'' been fucking your brains out!"
* In ''Film/TheSpecials'', 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?!" [[TheSnarkKnight Deadly Girl]] wryly asks if oral sex counts, then cheerfully announces "Doughnuts for everyone!"
* In the 1987 ''Franchise/{{Dragnet}}'' movie, after rescuing a would-be VirginSacrifice, Friday consistently refers back to it whenever he mentions her name. Until [[https://www.youtube.com/watch?v=BtKUyfkBA2w the very end]]:
-->'''Streebeck:''' ''[catches Friday yawning on the way into work]'' Long night last night partner? [[IncrediblyLameFun I thought the Christian Science Reading Room closed at ten.]]\\
'''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 with a smile, accompanied with a [[ThemeTune *BUM-BA-DUM-BUM!*]] ]''
* A couple times in ''Film/{{Mallrats}}'', other characters comment that Brodie is "glowing" shortly after he had [[ElevatorGoingDown elevator sex]].

* ''Film/AssaultOnAQueen'': The morning after he sleeps with Rosa, the normally grumpy Mark arrives at the sub whistling merrily. No one says anything, but it does draw odd looks from the rest of the crew.
* PlayedForLaughs in ''Film/SuperTroopers'', where Thorny and Rabbit open the back of the truck where Mac and Foster were trapped for several hours by the driver. The first thing Thorny does is take a whiff and say, "Smells like sex in here."
* ''Film/{{Wolves}}'': Minus the part where it's a question. When John finds Cayden in the barn with ClothingDamage, straw in his hair and in a very good mood, he doesn't need Angel to appear in a similar state to know what's up.
* A kid-friendly version in ''Film/LyleLyleCrocodile''. After Lyle has gotten Mrs. Primm out of her overly rigid routine, she appears much happier around her husband, who hestitantly asks her if she has someone new in her life. Her reply of "sort of" doesn't exactly help until Lyle himself finally clears the air.

* In ''[[Literature/XWingSeries 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 WingMan, 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 ''Literature/RainbowRoad'': "You two sure are smiley today. Did you finally bone last night?"
* After a night with Morelli in ''Four to Score'', Literature/StephaniePlum 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 ''Literature/InstrumentOfGod'': 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."

** Clancy did something similar with Literature/ExecutiveOrders: President Ryan's Secret Service detail can tell that he and his wife had sex the night before by the way the two are holding hands.

* In one of the ''Series/AlienNation'' books, Sykes ''tries'' to have sex with an alien, leaving him with bruises on his neck [[spoiler: 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.

* ''Literature/SongAtDawn'': Everyone can tell that [[spoiler: Dragonetz and Estela]] have had sex because their love ballads are suddenly much better.
* A more subtle example in ''Literature/TheLostFleet''. 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 WomensMysteries.
** This scene becomes HilariousInHindsight a few books later when Desjani develops feelings for Geary herself.
* ''Literature/CaptivePrince'': Prince Laurent's men see Damen and him sneak back to their quarters through a secret passage at night, with Damen looking blissed-out and tired, and draw the obvious conclusion. In a twist, Damen ''was'' having sex, just not with Laurent. Laurent reminds him to bathe before muster.
* Implied in the {{novelization}} of ''Anime/BorutoNarutoTheMovie''. Sarada mentions that her mother Sakura's skin shines now that Sasuke is back home. It could just mean that Sakura is happier now, but it also has a sexual interpretation.
* In ''Literature/CiaphasCain: Choose Your Enemies'', Cain sees both Colonel Kasteen and Major Broklaw entertaining the attentions of local nobles at a banquet in the 597th's honor, and wryly thinks to himself that neither the CO nor XO are likely to spend the night in their own quarters. Sure enough, the next morning, Kasteen is "gulping [[UnCoffee recaff]] with the air of someone who was tired but still relishing the process of having got that way."
* In [[Literature/VorkosiganSaga Captain Vorpatril's Alliance]], Ivan and Tej thoroughly enjoy consummating their [[Main/CitizenshipMarriage emergency marriage]]. The next morning, Ivan goes to work as normal. His boss (who knows about the marriage) sourly tells him to stop whistling.

* ''Series/BuffyTheVampireSlayer'': Xander does this to himself in the middle of a very weird night. The best part is that no one else figures it out.
* ''Series/{{Angel}}''
** This happens a couple of times between Angel and Wesley. In a season 2 episode, Angel demonstrates his SuperSenses by remarking that Wesley had sex with a bleached blonde the night before. In season 4 [[EvilIsPetty during his Angelus turn]], he mentions in front of the whole gang that Wesley has been having sex with Lilah.
** Angel is on the receiving end after he has sex with fellow vampire Darla.
-->'''Lorne:''' Jeez, keep your pants on! (Angel enters) Well, I see we're a little late with ''that'' advice.
* In ''Series/JustShootMe'' 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.
* In French series ''Series/LazyCompany'', Louise can tell almost instantly that formerly shy virgin Private Henry is not a virgin any more, because he is "a little taller, a little less honest".
* ''Series/{{Scrubs}}''
** 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: [[spoiler: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 season three of ''Series/{{Glee}}'' after Will Schuester and Emma Pillsbury [[UnresolvedSexualTension finally]] [[WillTheyOrWontThey have sex]] ([[spoiler:after the New Directions finally win at Nationals]]) Sue sees her the next day and quips "Why do you look different?"

* An episode of ''Series/WillAndGrace'' 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!"
** Karen is able to tell ''exactly'' what Grace has done with a man in a matter of seconds. Grace is understandably terrified of this power.
* In ''Series/That70sShow'', 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 ''Series/NightCourt'', 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 ''Series/WhosTheBoss'', Tony runs into [[SilverFox Mona]] after he's had a "successful" date. Mona nonchalantly busts him.
-->'''Tony''': [stunned] How could you tell?
-->'''Mona''': [[ReallyGetsAround How does a sailor know when a storm's a'brewin!]]
:::She also knows he didn't sleep with Angela, because she wasn't singing "Climb Every Mountain".
* ''Series/{{NCIS}}''
** "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 ''Franchise/PlanetOfTheApes.''
** 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."
* ''Series/{{Life|2007}}'': 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.

* ''Series/SpinCity''
** Loser Paul walks into work singing and skipping after having sex. [[https://www.youtube.com/watch?v=pcYhkj0quV8 He struts]] down the hall to the Bee Gees' "Stayin' Alive" ala ''Film/SaturdayNightFever''.
** James comes in one day with a subdued smile on his face, which piques Nikki's interest.
--->'''Nikki:''' That look... I know that look. You had sex last night.
* On ''Series/{{Cheers}}'', Woody Boyd and his fiancée lost their patience (and most likely their respective virginities) just one night before the wedding. Sam was the first to figure out why, of course.
-->''"You're smiling the way I smile after I..."''
* One episode of ''Series/StargateSG1'' features Carter and O'Neil riding an elevator with Carter humming the whole way, prompting [[https://www.youtube.com/watch?v=fXtIvIVuGa4 an amusing exchange]].
** It gets better: Word Of God says she was supposed to hum the ''Series/{{MacGyver|1985}}'' 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 ''Series/SeventhHeaven'' features Annie and Lucy sharing knowing glances over ice cream after they'd both gotten some.
* In season two of ''Series/VeronicaMars'', immediately after Veronica sleeps with [[spoiler:Duncan]] she bumps into [[spoiler: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 ''Series/DegrassiTheNextGeneration'': 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.

* Played Straight in ''Series/{{Bones}}'', Season 2, 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 ''Series/TheCloser'' gets very cheerful when she gets some.
* Though he really tries to hide it, Beckett can tell every time Series/{{Castle}} has slept with [[GirlOfTheWeek 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 [[spoiler: because she's trying to keep the fact that she and Castle have started a relationship secret from everyone.]]

* ''Series/{{Community}}'' played with this trope in the episode Modern Warfare. Jeff and Britta have sex on their study group's table during a paintball tournament, and as they both walk to their study group the next day, they remind each other "nothing's changed". Abed [[ExactWords instantaneously picks up on the dynamic changed and makes note of it.]] No one notices.
* Ron Swanson from ''Series/ParksAndRecreation'' always dresses like Tiger Woods after a night of sexytimes.

* Barney does this in ''Series/HowIMetYourMother''. "Aww, man, you guys did it, didn't you?"
* After spending the whole film/web-series longing after Dr. Kelly in ''Series/BattlestarGalacticaBloodAndChrome'', 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.
-->'''Coker:''' ''Just had to [[PardonMyKlingon frak]] her, didn't you?''

* ''Series/NewTricks'': The boys have this reaction when Sasha enters the office with a spring in her step in "The Lottery Curse". Leads to a SideBet about whether she had or not.
* ''Series/StarTrekVoyager'': In "[[Recap/StarTrekVoyagerS3E17Darkling Darkling]]", Kes is shown kissing a local alien, then later beams up to Voyager at three in the morning with her hair tousled and a sore back, grinning like she just got laid. The female transporter operator gives her a knowing smile.
* ''Series/EmptyNest''. Barbara takes one look at the post-coital Carol and is able to deduce that she just had sex. Charlie tops this by figuring out every single significant characteristic about him--"you're still flushed, so he must be pretty young", "it's the middle of the day, so he probably doesn't have a job", "judging from your posture, he's about this tall" (gestures with his hand just as the man in question walks in).
* On ''Series/TheGoldenGirls'', [[ReallyGetsAround Blanche]] likes to [[InvokedTrope invoke]] this trope whenever she has a particularly exciting experience with a gentleman caller, often deliberately acting out of breath or sighing heavily when she comes into the room. It often leaves her open to quips from [[DeadpanSnarker Dorothy]]: "Why do I suddenly feel the need to bathe?"
** Parodied in another episode when Sophia takes offense to being compared to a pet; [[HypocriticalHumor right afterward]], she ''sniffs'' Blanche and says "You've been with a man, haven't you?"
** A variation occurs in "Mary Has a Little Lamb," when the girls' teenage next-door neighbor Mary comes over for a visit. After Dorothy, Rose, and Blanche greet her, Sophia enters, says hello, and immediately asks "When's the baby due?" Mary confirms that her boyfriend has gotten her pregnant, and Sophia explains that she recognized the similarities to Dorothy when ''she'' came home "in trouble" as a teen.

* ''VideoGame/KnightsOfTheOldRepublicIITheSithLords'': 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 "[[UnusualEuphemism hooked up a power coupling]]".

* ''VideoGame/DivinityOriginalSinII'': Malady might be on the verge of a HeroicRROD from ThinkingUpPortals, but can still spot the afterglow from a player character's OptionalSexualEncounter:
-->''"What's wrong with you. You seem... ''happy''."''

* ''Webcomic/QuestionableContent'':
** Faye's commentary when watching Marten going home after being away longer than anticipated: "[[http://questionablecontent.net/view.php?comic=840 He is skipping. A bluebird just landed on his shoulder!]] [[SpontaneousChoreography Random pedestrians are joining him in a complicated dance routine!]]"
** Dale [[http://questionablecontent.net/view.php?comic=2642 attempts]] to {{Invoke|dTrope}} after he and Marigold finally resolve their UnresolvedSexualTension, but Faye sees through his leading statements and is just annoyed.
* The WebComic ''Webcomic/WapsiSquare'' does this [[http://wapsisquare.com/comic/grabtheheadboard/ here]] and [[http://wapsisquare.com/comic/illcallyoulater/ here]] with (another) Monica.
* Makes an appearance in [[http://leasticoulddo.com/comic/20040305 this]] ''Webcomic/LeastICouldDo'' strip.
** 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).

* ''Webcomic/{{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"

* ''Webcomic/OutThere'': The insightful Miriam concludes that Sherry has broken her long dry spell upon observing the latter's visible discomfort with discussing the topic [[http://outthere.keenspot.com/d/20100602.html]]; James makes a lucky guess based on a similar observation [[http://outthere.keenspot.com/d/20100707.html]], and Clayton explains the most compelling reason she's unable to conceal what everybody else can see [[http://outthere.keenspot.com/d/20100708.html]].
* ''Webcomic/DanAndMabsFurryAdventures'': Alexsi is very happy after her date with Pyroduck. [[http://www.missmab.com/Comics/Vol_1107.php This trope is all but confirmed here.]]
* ''Webcomic/SabrinaOnline'': Zig Zag always seems to know when Sabrina's been with her boyfriend. In Zig Zag's case it's not "Did you just have sex," but "You got laid! Good for you!"
* In ''Webcomic/{{Rhapsodies}}'' Kate's employees have noticed this... frequently... [[http://rhapsodies.wpmorse.com/?p=1874 and it's getting on their nerves.]]

%%* ''Magnificently'' set up in ''Webcomic/MenageA3'' in [[http://www.ma3comic.com/strips-ma3/brainlocking this strip.]] The actual dialogue appears, in variant form, in the next strip, but the facial expressions in that last panel there say it all.
* Mordred says it (although not in so many words) in [[http://www.arthurkingoftimeandspace.com/0513.htm this]] ''Webcomic/ArthurKingOfTimeAndSpace'' strip.
* Joe says this to Danny in [[http://www.dumbingofage.com/2013/comic/book-3/03-answers-in-hennessy/petting/ this]] ''WebComic/DumbingOfAge'' strip, after the latter strolls into their dorm room practically singing. He's not that far off.
* ''Webcomic/{{SSDD}}'': It doesn't take much for Corporal Gray to figure out that not only Julian and Tessa (whom he's been subtly trying to set up) got laid last night, but also [[http://www.poisonedminds.com/d/20120308.html everyone else on the squad]].

* In ''Webcomic/ElGoonishShive'': Susan [[https://www.egscomics.com/comic/balance-051 lets her mind run]] after seeing Catalina in even better mood than usual.

* ''WesternAnimation/TimeSquad'' 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 the ''{{WebComic/Homestuck}}'' fanfic ''[[http://archiveofourown.org/works/710801?view_adult=true&view_full_work=true Like Lovers Do]]'' Aradia manages to not only tell that Eridan and Feferi have pailed, but also to convey her [[IKnewIt smugness]] about it without saying anything in particular.

* ''Anime/MobileSuitGundam00'': ChasteHero Setsuna asks his teammate Lockon "what are Allelujah and Sumeragi doing next door?" in the CD drama.

* ''Series/StarTrekVoyager''. In "Darkling", Kes is shown kissing a local alien, then later beams up to Voyager at three in the morning with her hair tousled and a sore back, grinning like she just got laid. The female transporter operator gives her a knowing smile.

* ''LightNovel/{{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.

* ''LightNovel/HaruhiSuzumiya'': In the tenth novel, when Kyon is acting more cheerful and upbeat than usual, Taniguchi mutters "What's with you? Don't tell me you and Suzumiya finally...no, never mind." Considering that he makes no secret of the fact that he assumes the two are dating, it's pretty clear he thought they had their first time when he wasn't paying attention. [[spoiler:They didn't]].

* ''LightNovel/{{Shimoneta}}'': Zigzagged in chapter 10, when Ayame walks in on Tanukichi and Oboro in the girls' locker-room and sees Tanukichi has pinned Oboro on the floor. Then sees Oboro is breathing heavy and smiling with a faint blush from just having [[spoiler: [[TheModestOrgasm his first orgasm]]]]. Ayame doesn't say a word, but [[NotWhatItLooksLike clearly thinks]] [[SorryToInterrupt she's interrupting]][[note]]What really happened: Oboro is a guy who [[DudeLooksLikeALady looks]] ''[[CrossdressingVoices and sounds]]'' like a darkhaired girl. Tanukichi had set a trap for Gathered Fabric and mistook Oboro for one of them, because the room was dark. So he wrestled him to the floor to capture him, but didn't realize his mistake until the lights came back on. However, Tanukichi realized his foot was pressed against Oboro's crotch, which when it dawns on him that Oboro is actually a male, but he [[CrotchGrabSexCheck double checks to be sure]] and inadvertently causes Oboro to [[TheModestOrgasm get off from it]], which is when Ayame walked in. She sees Oboro disheveled on the floor with Taukichi holding [[LonghairedPrettyboy "her"]] legs open and her panties were [[JizzedInMyPants visibly wet]], so Ayame assumes Oboro and Taukichi had just finished having sex[[/note]] so she ducks back outside and slams the door behind her.

* ''LightNovel/RebuildWorld'': When the protagonist's [[TheSquad Squad]] of PrivateMilitaryContractors (known as "Hunters") take an hour of R&R from their medevac operation, the OldSoldier Shirakabe gets shoved into the back of his APC by the HeroicSeductress Carol, so she can sleep with him for information after he repairs and restocks the vehicle. Since Shirakabe is known for being early, him meeting the rest of the squad exactly on time afterwards alongside Carol, leads to an awkward exchange with everyone else staring at him because they could figure out what happened.

* Victoria, in the ''VideoGame/DragonAgeInquisition'' fanfic ''[[Fanfic/TwiceUponAnAge All This Sh*t is Twice as Weird]]'', knows that Mahanon is setting up his GrandRomanticGesture for Cassandra. When she wakes in the morning and finds that [[InnocentCohabitation his bed wasn't slept in]], she figures out what happened; when he comes back to the room a little while later, she proceeds to razz him as only an honorary little sister can.

* ''Manga/TalesOfWeddingRings'': In chapter 57, Krystal and Satou return to the party after spending the previous night having TheirFirstTime. The other princesses immediately notice that something is up: Satou seems more confident than usual, Krystal is keeping an awkward distance from him, and she's started [[FirstNameBasis calling him Haruto]], his first name which none of the other princesses have ever heard before. [[DeadpanSnarker Saphir]] is the first one to put all the pieces together, and she spells it out for the others:

* ''Magnificently'' set up in ''Webcomic/MenageA3'' in [[http://www.ma3comic.com/strips-ma3/brainlocking this strip.]] The actual dialogue appears, in variant form, in the next strip, but the facial expressions in that last panel there say it all.

* ''Webcomic/{{Girly}}'':
** Policeguy does [[http://girlyyy.com/go/202 indeed break into song and dance with animals and rainbows.]]
** Hipbone gets one [[http://girlyyy.com/go/562 later on]], resulting in [[http://girlyyy.com/go/564 surprisingly long-lasting benevolence. Eventually it wears off.]]

** Karen takes this UpToEleven. She's able to tell ''exactly'' what Grace has done with a man in a matter of seconds. Grace is understandably terrified of this power.

This is when a character not known for their sexual prowess acts differently enough (usually more cheerful or mellow) for other characters to notice and question it. They (and sometimes the audience) find out that it is because said character somehow got laid.

* ''Series/{{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!"

* ''Series/{{Community}}'' played with this trope in the episode Modern Warfare. Jeff and Britta have sex on their study group's table during a paintball tournament, and as they both walk to their study group the next day, they remind eachother "nothing's changed". Abed [[ExactWords instantaneously picks up on the dynamic changed and makes note of it.]] No one notices.