Due to censorships, anime has a funny way of implying a scene where the characters may have sexual intercourse. It happens in manga, too.
*Spoiler alert! Read at your own risk.
Put the reasons on the character page on this concept page if it is not on the episode or volume page. List the franchise, anime, or manga in alphabetical order.
Just follow the example below and link the episode and image here.
In episode 9 "White," Aoi and Kaoru have a nice date in China Town and spend the night alone in a hotel room. After obtaining Miyabi's permission to spend the night at the hotel (Kaoru calls Miyabi), Kaoru tells Aoi that he always thinks about her happiness, and the two share a passionate kiss while the camera moves away from the two love birds to the city lights. It is possible that the two had sex or not.
In the third season episode "The Southern Raiders", Zuko is trying to find Sokka and ran into a very flustered Suki who rushes off. Zuko enters Sokka's tent to find him without pants and laying on the floor surrounded in flowers and candies, saying "Well, hellooo..." in a suggestive tone before realizing who it was. The two briefly chat before Sokka rushes Zuko out and tries finding Suki. The following day, we see Sokka fiddling with a flower necklace and he literally exclaims, "I got lei'd".
In episode #06 there is one implied sex scene. Kou Yonamine surprised Yuuri Kitajima in a hallway with a kiss and she replied with a slap in the face. He showed her a cell phone and said he have something for her that she will like. Later they will find to be alone in a room, and she was putting her close back on. It was shown that Kou is a smoker, and later on Yuuri's coworker told her she reeks of smoke and she should wear a perfume. In episode #11 it's shown that Kou and Yuuri were going out at some point in the past. It is unclear if they were in a relationship when that implied sex scene happened in episode #6.
In episode 11, Renji and Chihiro profess their love for one another on the rooptop of their school and embrace one another. The next shot features the clothes of both characters folded neatly and they are shown to be naked lying on the rooftop with Chihiro resting on Renji's chest.
-In episode 4 "Are you two going out" of the Genshiken 2 anime, Souichiro Tanaka and Kanako Ohno both like each other, but they both are afraid to confess their love for each other. When Saki tells Kanako to cosplay, Kanako decides to cosplay as a hentai character. Meanwhile, Tanaka talks to his buddy (big guy working on the computers) about him being weak in front of Kanako. Despite Tanaka's friend's fear of asking a girl, Tanaka heads to Kanako's house. Kanako pressures Tanaka to reveal his hentai games, and she picks one character and makes Tanaka play the game to "beat" scenario. However, Tanaka gives up and confesses his love to her. Kanako tells Tanaka that she will help him be confident by kissing him when she turns the light. After they discover that they both are virgin kissers, Kanako talks to Tanaka if he wants to go a "little further." The two engage and kiss each other with passionate and erotic moans as the viewers see the hentai game case. The erotic moans end with Kanji Sasahara drinking water and moaning the same way.
-In chapter 47 of the manga, Sasahara makes a visit to the apartment of Chika Ogiue to critique her yaoi manga. After looking it over, Sasahara admits that he did get somewhat turned on reading through it, despite not being gay, and admitted that her work would naturally lead to that kind of reaction due to the effort she put into it, despite her use of Sasahara and Madarame as characters for her work. This critique surprises Ogiue, who was worried about how Sasahara would react to using him as a character for her work. When Ogiue is asked by Sasahara if she only sees him as a character, she admits it isn't the case and is asked again about answering his confession of love to her from earlier on at the summer trip. Ogiue says that Sasahara should know her answer, as hearing from him that she put love into making her characters in his critique made her happy and that she would stop trying to run away from her interest in her hobby. Sasahara is clueless over the implications of what Ogiue is saying, which annoys her as she sits next to him on her couch and says that he needs to be an "aggressive top" and learn to be more assertive so they got over the awkwardness of their relationship more earlier on.
Sasahara then proceeds to tease Ogiue by looking through her manga work again, commenting on how graphic it is and that it would shock Madarame if he ever learned about it. This action gets Ogiue very flustered, as she tries telling him to stop spreading all the pages out and knows how much of a shock it would be for Madarame to see it. As this presses on, the two eventually kiss one another. After a brief pause where the two are embarrassed of what they just did, Sasahara proceeds to kiss Ogiue's neck before the flustered girl stops him as she comments they are doing this just as they were looking through her graphic yaoi. Sasahara remarks that it wasn't his intention for the situation to come up, but decides to "take this opportunity to show [her] just how aggressive [he] can be." Ogiue comments "oh really" to the declaration and Sasahara acknowledges his claim as the scene changes.
It happens on two different occasions in the anime between Shirou and Saber. On Tohsaka's urgings to replenish Saber's mana in order to defeat Berserker, Shirou has to do the unthinkable to Saber, who he likes. Interestingly, this concept of giving mana through sexual intercourse reflects a Chinese religion and others.
Hints: Saber tells Shirou: "You know my past, and you've entered me so many times."
It happens once in the movie between Shirou and Rin Tohsaka. The same reasons as the anime except Shirou is the one who needs the mana. The scene changes to Shirou who "enters" Rin and sees her memories and flashbacks. Interestingly, Rin hits Shirou for seeing her memories whereas in the visual novel, she hits him for being too "rough."
See movie page.
After being rescued against military forces in episode 25, Batou is brought to one of Motoko's hideaways by one of her remote cyborg bodies. After tending to his wounds, Motoko appears in lingerie in her regular cyborg body and Batou is shirtless throughout the scene. When a search helicopter is about to emit a search light through her window, Batou grabs her out of the way and the two are in intimate range of one another as they wait for the helicopter to leave the scene. Batou gives Motoko her watch back from earlier and the two head to bed in Motoko's room as the scene switches to a far shot of the building that Motoko's hideaway was in.
Clues that suggest the two had pre marital sex:
In the OAD, Drifters of the Dead when Saeko and Takashi are alone after they escaped from the hallucinatory emissions of the hydrangea, Saeko tried to seduce Takashi and confessed her feelings for him, as a result, the two teenagers started kissing and touching each other with passion while the camera slowly moved away as a transition for the next scene. Although it was all a hallucination, it is a clear example of an implied sex scene. Another point, is that the sex scene could be Takashi's imagination or Saeko's imagination due to another scene where Saeko and Rei are kissing each other at sun rise.
Another pair, Saeko and Rei, are found kissing each other. Due to the hydrangea's hallucinogenic properties, the two girls thought that they are having "sex" with Takashi when it turns out they have sex with each other.
In episode 4, Mayama is accompanying Rika on a trip to Hokkaido as the latter visits where her burnt-down home used to be. The two embrace as Mayama comes to learn that Rika is starting to show signs of moving on from the death of her former lover. The next scene then shows the two sleeping together in a hotel room with only their heads and shoulders visible from the blankets covering them.
In episode 5, Koko and Valmet are sharing a hotel room together with Koko clearly having a bit too much to drink with her drunken behavior and sloppy pouring of wine. Valmet offers to get Koko to bed and taking advantage of the opportunity, a giddy Valmet offers to shower together with Koko and sleep with her in bed afterward, promising to "wipe away [her] exhaustion." As Valmet is about to undress Koko, the scene cuts away to a shower faucet being started up and then a far shot of the hotel they are staying at as the viewer hears Valmet's giddy declaration.
In episode 12 "The Machine That Dreams", Jiro is taken by Mitsuko to have his arm reattached to his body. The scene is fairly infamous among fans of the series for having implications that the two might have been doing something much more. Hints that something might have happened:
Once Koshiro and Nanoka come to terms with their feelings for one another in episode 12, they kiss. The scene then changes to a camera shot of the top of a table with an apple on it as the two siblings talk of what they are about to do and Koshiro asks if Nanoka has any regrets. Another camera shot occurs which implies to take place later in the evening where we get a close shot of Koshiro and Nanoka lying together, having nothing but a sheet covering them.
Masayoshi discovers his best friend, Eutus, and his crush, Mune Mune, shoes on the porch, and he hears something wrong. After that, Masayoshi takes up drinking since his heart is shattered. Masayoshi tries to kill Eutus, but he knows what Masayoshi is up to so he vanishes from Masayoshi's eyes.
See episode 7.
At the end of episode 4, Sorata promises to take Mei out on a date as a reward for contributing to their latest theft. For their "date", Mei and Sorata are in the latter's bedroom with both in states of undress with Sorata in a T-shirt and boxers and Mei in some negligee. The two get on Sorata's bed where Sorata lies down and much of the lower half of his body is strategically obscured with a chair from a far camera shot. We then get a close camera shot of Mei's head and shoulders as she is about to go down with Sorata saying she's "so excited". The camera then goes back to a visibly flustered Sorata with the mentioned strategic shot and then the camera cuts to a picture of Mei and Sorata as we hear meowing and howling sounds from the two as the episode ends.
In episode 22, Yukino confronts Shizuru about her apparent actions with Natsuki. The scene then changes to a flashback where Yukino is using her Child to spy on Shizuru and Natsuki in silhouette behind a screen window. While Natsuki lies sleeping in a futon, Shizuru disrobes from her kimono and implied to be nude as she lies alongside Natsuki. While there is nothing further shown of what happens, Shizuru's apparent actions are enough to disgust Yukino and shock Natsuki when she overhears what is going on.
In episode 5 following his assassination of a mafia leader's wife and son, Zwei walks into a room with Claudia McCunnen, who is wearing nothing but a bathrobe and slippers. Claudia hugs Zwei saying that he is wonderful as a light from the window of the room turns off and the scene changes to Ein alone in her room.
In episode 10, Setsuna Kiyoura is in Makoto Itou's room. She tells Makoto to promise her that he will protect Sekai. Makoto pushes Setsuna down on his bed and kisses her. Setsuna (with tears streaming from her eyes) tells Makoto that he can do anything to her if Makoto will keep his word to protect Sekai.
In a flashback of Ritsu's high school days, Ritsu remembers when he had confessed his love to his senpai, Saga, and they had started dating (The dating was implied and not directly stated). In the flashback there was a scene where his senpai didn't have a shirt on, they were in bed, Ritsu's shirt was unbuttoned completely, a sheet was over them, and they were kissing. Ritsu grips his senpai's hair, and in the next scene they are seen asleep in the same bed until Ritsu snaps out of the flashback scolding himself for thinking about a person whose face he can't even remember.
The inner monologue during the scene may suggest it because Ritsu was being pessimistic at the time saying that it didn't matter if you were hurt a little in love, but he had never tried to fall in love from that day on. The biggest evidence that this scene is most likely implied sex is because the same scene in the manga is an actual sex scene.
See episode 1.
In the eighth episode, Lain is being accused of spreading rumors about Arisu having an illicit relationship with a teacher at her school throughout the Wired. As Lain is ostracized by her classmates, she decides to go into the Wired to handle the issue. Meanwhile, Arisu is recalling an encounter with the teacher in her bedroom where it is implied that they might have had intercourse, with the teacher asking if this was something she wanted to do despite the repercussions both would likely face as he embraces her from behind. Arisu says she has no regrets. When Arisu stops recalling the situation, she is shocked to discover one of Lain's wild personalities appearing before her, who accuses her of masturbating to the moment she had with the teacher as a camera shot shows Arisu with a hand between her legs. This leads to a rift in Lain and Arisu's developing friendship, as the latter assumes Lain is consciously spreading the rumors about her.
So far it happens once in the manga and not yet in the anime. When Anna tells Yoh that this is the last night that he will spend in her house, she asks Yoh if she can sleep beside him. Yoh says yes.
See volume 9 and the image on this page.
Note: It has been confirmed in episode 25 that Yoh and Anna did not have an implied sex scene in the anime.
The implied sex scene occurs between Majic and Fiena. After they escape from the funeral pyre (where Majic is fully clothed underneath Fiena's ceremonial wolf outfit), the next scene reveals Fiena is standing on a balcony looking out while Majic is sitting on the bed, shirtless. Majic is pulling on his boots (aka The Kirk Maneuver). He then walks up and embraces Fiena from behind.
See episode 6.
In episode 22, Kurisu and Rintarou are caught in the rain so they hurried back to the lab. Rintarou told her that he is in love with her and then they kissed. She told him she never kissed anyone before. He said that was not his first kiss but his first kiss wasn't at all romantic. After that they kissed again. In the passing scenes Kurisu thoughts were: "Time is passing so quickly. Right now, I feel like complaining to Einstein. You know, Okabe, whether time passes slowly or quickly depends on your perception. The theory of relativity is so romantic... and so sad."
The anime has a number of implied scenes among its female cast throughout the show's run. Here are some examples:
In episode 10, Kirito spends the night with Asuna in the same bed. The scene can be debated both ways. Here are the hints for an implied sex scene.
Following a scene where Milly comforts Wolfwood as the latter contemplated over his murder of Zazie the Beast in episode 23, the next scene shows a shirtless Wolfwood smoking by a window with Milly sleeping in bed.