Ebichu has an Office Lady's boyfriend doing this a couple of times.
Wolfwood from Trigun does this after his implied romp with Millie.
In Watchmen, Laurie and Dan have sex and in the next scene Laurie is seen in a panel naked and smoking a cigarette. Earlier, after they had fought a punk gang in the alley, they looked guiltily away from each other, and Laurie lights up... fairly obvious subtext there.
Played with in the film version of Fight Club, with Tyler Durden smoking after his first fight with The Narrator.
During Black Sheep, the New Zealand comedy-horror film, a character locks himself, and the "prototype" of a new breed of sheep, in his study to protect them from man-eating sheep. When we next see him, he's smoking a cigarette.
In the book Millennium by John Varley, the hero, Louise Baltimore, is from the future. The air has become so polluted that humans have been adapted to it. When she travels back in time to the 20th century, she is constantly smoking cigarettes to help her breathe. Anyway, this is all leading up to when she finishes sex, she immediately lights one causing her partner to comment, "Do you always smoke after sex?". She then looks at her crotch, to make the obvious joke.
The Time Traveler's Wife is well aware of this trope's implications, using it to point up just how stereotypically masculine Gomez is. (Henry, a more sophisticated sort, notably does not engage in this.)
Played for Laughs (rather morbid laughs, but still) in Ghost Story, after ghost!Harry briefly possesses Molly's (his apprentice who is hopelessly and unrequitedly in love with him) body. When they are separated again, Molly grimly quips something along the lines of, "So you've finally been inside me. I feel like I should offer you a cigarette."
In the Doctor WhoEighth Doctor Adventures novel The Gallifrey Chronicles, Fitz and Trix have an implied intimate moment. Fitz lights a cigarette after and she scolds him, since he's from the 1960s but she's not and doesn't share his belief that it's normal for everyone to smoke everywhere at any time. He complains about how weird it is that people from the future must "all just go straight to sleep", but eventually submits to being kicked out of his own bed to go smoke elsewhere (wearing a dressing gown), where he runs into the Doctor and catches another lecture for smoking. Oddly, despite how suggestive that entire scene was, she later claims to have never had sex with him, in a situation in which she'd have no reason to lie.
Referenced in an episode where Becker is trying to quit smoking. He gets frustrated and manages to replace one addiction with another by gaining a sex buddy. We're shown that they've had sex by a quick cut to them lying next to each other in bed, looking exhausted. Becker remarks "I just remembered another cigarette I really miss".
When he crawls down the fire escape to retrieve his last cigarette, which he dropped out the window, and encounters a couple having sex in the apartment below, they are shocked - and then he asks, "I don't suppose you two are going to have a smoke after you're done?"
Referenced in White Collar, when Neil discreetly pats down a woman by pretending to make out. When she does the same to him, one of the surveillance officers remarks: "You'd need a cigarette after that pat-down."
Marcy was fighting stage fright in front of a group by imagining herself in bed. It got so intense that she had an orgasm right in front of everyone and was seen with a lit cigarette in her hand that just appeared out of nowhere.
Al was also seen smoking a cigar after a particularly vigorous session with Peggy that not only lasted a full day (or maybe even several), it made her hair stand on end.
Bud smoked a pipe after having sex. It made him cough (the smoking).
The "I don't know, I never looked" punch line came up in one episode of The Closer.
Shows up fairly frequently (as in, five minutes into the pilot and then a lot afterwards) in Mad Men (Duck Phillips does this after doing ahem with Peggy like it's his job), though this might be a reflection of the fact that on that show, Everybody Smokes constantly. It also fits well with the style of the show, as creator Matthew Weiner says he tries to use elements of the "visual vocabulary" of the time in the show.
The pizza variation appears in an episode; Rimmer recounts the one and only time he made love, which only took twelve minutes, and that includes the time it took to eat the pizza. Of course, he gets another chance later. Pizza is mentioned again, when he thinks two slave girls are planning on interrogating him with sex, he demands they have a four-cheese pizza ready at the end. Apparently, Rimmer really likes pizza.
Kochanski describes her relationship with Lister as "hanging out in your bunk, eating take-away curries and having fantastic sex."
Scrubs includes the after-sex pizza version. Of course, it's not so much after-sex pizza as between-sex pizza.
Referenced hilariously in Wings. Lowell declares that he's going to move out of Joe and Brian's house so that he and reconciled ex Bunny won't feel so "inhibited". Brian's incredulous response? "THAT was inhibited? When you were done, I smoked a cigarette!"
Parodied in Seinfeld. George's girlfriend makes numerous orgasmic moans while eating a risotto, and upon finishing, lights a cigarette.
Occurs in several skits in Chappelle's Show. In one notable one, a film camera shows (among other things) the last person an individual had sex with, while showing both individuals smoking.
Babylon 5: The pizza variation is referenced at the end of Susan Ivanova's hilarious "human sex" act with the Lumati ambassador, the ambassador asks, "what do I do now?" Ivanova responds:
Old style, you roll over and go to bed. New style, you go out for pizza and I never see you again.
Mystery Science Theater 3000 had a field day with the movie Clonus; Because of a bad camera angle, a smoldering campfire is positioned behind the male lead's pelvis following a sex scene, leading to lots of jokes along these lines. Reportedly, it was these jokes that made the film's director glad they'd granted MST the rights to spoof it.
Dave Allen mentioned this on one episode of his show after he'd quit smoking. It can be found here.
Parodied, kind of, on "Will and Grace," when Karen reads Jack's hot gay romance "novel" and apparently enjoys it so much that she has to have a cigarette afterwards (and surprisingly, despite her many addictions, she is not portrayed as a smoker otherwise). Made even funnier because Grace is in the room and misunderstands Karen's vehement exclamations as being in response to her problems with Will, to which Karen isn't listening at all.
The trope is used for Clingy Jealous Girl effect when Buffy sees Faith sitting on a bed with Shirtless!Spike, sharing a cigarette. Although the audience knows they didn't have sex, Buffy is not pleased.
In a Mr. Show sketch, a character played by David Cross does this after spending time on a phone sex line (actually his male friend pretending to be a call girl).
On Gilmore Girls, Lorelai and Jason have separate angry business calls between having sex. Lorelai sarcastically compares it to the traditional cigarette.
Lorelai also makes a reference to the trope in the first season when discussing her new boyfriend Max with Babbette.
In one episode of Northern Exposure, Joel and Maggie manage to have sex (or at least achieve mutual fulfillment) without ever physically touching each other, and then share a cigarette afterwards.
In The Stinger for the Monty Python's Flying Circus episode "Spam", Karl Marx and Che Guevara (who had been caught making out earlier) are seen in bed smoking a cigarette and cigar respectively. Then Karl turns off the light (ready for round 2 apparently).
Parodied at the end of Lady Gaga's video for Bad Romance, after setting her lover/master on fire.
The folk singer Damh the Bard, introducing an explicitly steamy love song, claimed that after he once performed it, a woman in the front row commented, "I want a cigarette!"
Parodied in B.C.. A bee is eating out of a flower, then flies over to another one, thus performing pollination. The two flowers stare at each other smoking cigarettes as the bee flies away.
On the NPR radio show A Prairie Home Companion, Garrison Keillor once described a cartoon he saw that had a chicken and an egg lying in bed. The egg was somehow smoking a cigarette, and the caption read, "Well, I guess that answers that question." This has been drawn several times with slight variations. One version can be found at the bottom of this page.
Similar to the Dave Atell quote, when The News Quiz discussed the UK smoking ban, Phil Jupitus wondered what people would do after sex. Juggle? (Fred McAuley then pointed out that you only weren't allowed to smoke in a workplace...)
If you have sex with the prostitute in Leisure Suit Larry, she will be seen smoking a cigarette after the deed.
In Spellcasting 101, you and anyone you sleep with smoke after the deed (Assuming you haven't dropped the pack of cigarettes). In 201, this is changed to eating lollipops, and in 301 this is changed to eating breadsticks.
Solid Snake smokes a cigarette after major battles. The second game makes it canon that this is because killing feels like sex to him.
From Questionable Content: after a night of, well, "chatting" with another AnthroPC, Pintsize comes out smoking a cigarette. No one knows where he got it from and, knowing Pintsize, they're worried he'll do some property damage with it. A variation appears here where Faye implies that unloading that much scorn is a pleasure comparable to sex.
A spoof to the newest advertisement of the ps3 can be found here
One Sinfest comic has the devil girl Baby Blue attempting to corrupt the innocent nerd, Criminy. He demonstrates the use of his telescope in a scene rife with Innocent Innuendo. At the end, the rather impressed Blue says that she needs a cigarette.
In Something Positive, Davan was strung out on painkillers after an accident, and one of his female acquaintances thought he looked strangely attractive that way. This trope ensued.
On Maddox's The Best Page in the Universe, an article about women's fashion features a cartoon about two cosmetics chemists coming up with names for shades of red lipstick. After the two list particularly long and ridiculous names, one of them remarks, "Hand me a cigarette, because I just came!"
Variation: The Nostalgia Critic smokes a cigarillo after having a fanboy orgasm at a great death scene in Double Team.
In "Amazon Women in the Mood", the skeletons of men killed by "snu-snu" have cigarettes in their hands. The show uses this for the first time in the fourth episode in, starting Leela's reluctant running joke about "crossing paths" with Zapp Brannigan.
Season 15 episode, "The Ziff Who Came to Dinner", has this trope in one scene with Artie Ziff and Selma after they had quick sex with Selma smoking.
"Regarding Margie": Happens near the end of the second act with Skinner and Edna seen with their ragged clothes on after sex with Edna smoking a cigarette.
Skinner: You know, I think about you all the time.
Edna: Birthday's over, Seymour.
After Bart and Homer take the dancers cigarettes they throw them to the mayor who is in a bed and praying for a cigarette.
In "22 Short Films About Springfield" when Apu goes to a quick 5 minute party. He finds a single Indian woman, dance together, enters the pool shack with her, and exits with his clothes loose and smoking a cigarette.
In The Brak Show episode "Cardburkey", Brak and Clarence move out into cardboard houses in hopes of getting laid. Clarence has sex with a vicious bloodcat, and comes over to Brak's house smoking a cigarette.
In the "Toy Story 4" sketch of Robot Chicken, a grown-up Andy has sex with a girl in his bedroom. While the toys' horrified reaction could have been a decent closure to the skit, with this being Robot Chicken, it goes further beyond that, and the addition of this very trope is what causes things to go downhill, and ends the sketch on a verybleak note.
For those afraid to look it up: Andy turns Buzz into a bong, which reduces Buzz to the state of a mentally disabled person, forcing Woody to Mercy Kill him.
After losing his virginity in Moral Orel, Reverend Putty does a "hipper" sermon the next day while smoking a cigarette.