Double Standard Rape Female On Female is in large part based on the idea that women and female sexuality do not contribute to "legitimate" sexual intercourse, and are thus not capable of inflicting damage. Men, penises, and penile penetration are required to cause harm; without a penis involved, there can be no sex, and without sex, there can be no rape. Therefore, anything a woman does to another woman is "not a big deal".
It should be noted that, at least in the United States, this viewpoint was legally supported until the 1970s. The definition of "rape", historically, was defined as the act of forcing sexual intercourse on a woman by a man. Currently, all states define rape without referencing the sex of the victim or the perpetrator, acknowledging that women and men can both rape and be raped, but many people still believe that the presence or absence of the penis determines whether any given sex act is actually sex or not. In other locations, the presence of the penis is still required for an act to be legally considered "rape" rather than "unwanted sexual touching" or other such descriptions.
This trope is invoked where women raping other women is seen as harmless or even sexy, and therefore not worth fretting over. After all, Girl on Girl Is Hot, no matter what the victim may think of it. In some cases, authors who would demote male rapists to Complete Monster status within a story forgive female rapists, and/or consider their relationships to be loving. The emotional impact of the rape is largely dismissed or ignored completely, usually because it would be less appealing to the audience for the victim to be legitimately traumatized, and ideas of consent and personal violation aren't often brought up at all: the female rapist is often seen as being too overcome with emotion to resist the urge to rape, but since she lacks a penis and therefore has no sexual potency, she is Easily Forgiven. Don't expect victims to think about it too hard, or at all, after the fact.
Obviously this trope describes a Double Standard, and an extremely insulting one, in that it supports not one, nor two, but fourUnfortunate Implications:
Women are so weak and ineffectual they just can't harm anyone physically, not even other women, even less by sex.
A Kiss, Love, and a Prince involves a girl tying another girl to a chair for a forced kiss scene.
In Love Hina, male characters generally get pummeled for touching female characters whether they mean to or not, yet intentional female on female assault gets brushed aside or completely overlooked (like what Kanako does to Motoko). See similar examples in other harem comedies.
In Ikki Tousen during Ryofu's first TV episode she immobilizes and rapes one of the show's most popular characters, Ryoumou, after defeating her. This is never brought up again (not even by Ryoumou) and she even becomes an Ensemble Darkhorse herself.
In Dragon Destiny it was revealed that Shrinking Violet Ten'i was gang raped at her former school by a sadistic Alpha Bitch and her Girl Posse, and they pretty much used this trope to justify their actions. This is only an in-universe case: the show itself makes it clear that the girls are Complete Monsters.
Strawberry Panic! pulls this off with Kaname (and to a lesser extent Momomi) on Hikari. The solution to many troubles Kaname had throughout the series was, "Rape Hikari!" She never succeeds, and while it's clear other people disapprove, she faces no consequences for her obviously creepy intentions.
In the one-shot manga 08.04 AM Daydream, most of the patrons of the girls-only train seem to believe this.
Seikon No Qwaser plays this trope straight for the most part. In fact, all kinds of ripping a girls clothes off and fondling her from men and women is viewed as a normal thing. One scene in the first season even has Mutsumi saying "Don't worry, this can't be considered as rape" when raping female lead Mafuyu.
In Boys Empire, Umeko rapes Hitomi's mother as part of her "negotiations".
In Shitsurakuen, Sora chooses to molest Reiko rather than beating her. Given the situation, though, it was probably the lesser of two evils.
Mahou Sensei Negima! illustrates the double standard extremely well one character. Namely, Paio Zi, the breast-obsessed bounty hunter. When first encountered, Paio makes no attempt to hide what will follow if Nodoka is captured, and the scene is played out every bit as seriously as you would expect Attempted Rape to be played out. Then in a later chapter Paio makes a return, except in this case it is revealed that she is a girl as well, and her subsequent groping of all the girls in the bathhouse is played up for pure comedy value.
On the other hand, Psycho Lesbian Tsukuyomi is portrayed as a seriously dangerous and unbalanced woman, and her Attempted Rape of Setsuna is not played for laughs. Negima can't seem to decide whether to adhere to the double standard or not.
Mawaru-Penguindrum sends some mixed signals with regards to this. On one hand, Yuri's attempted rape of Ringo is definitely not portrayed as okay or funny, and it's made clear that the would-be rapist is an extremely messed-up person. On the other hand, the scene features an uncomfortable amount of Male Gaze, it's used to develop the would-be rapist and not the victim, the way Shouma stops it from happening is played as a complete joke, and the scene has no repurcussions to speak of; Ringo suffers no trauma from the ordeal, Yuri gets nothing more than a verbal slap on the wrist for her actions, and the incident is never brought up again in any way.
Queen's BladeRebellion Luna Luna makes a lot of advances on Annelotte, and she does it with her Combat Tentacles, saying she is her destined soul mate.
In Heaven's Lost Property, Tomoko generally gets away with a lot of what could be considered sexual harassment. Inverted though. When she turns back into Tomoki after a day of harassing women at a female spa? Cue signature Karate chop.
In Lost Girls, Alice forces Wendy to have sex with her, though Wendy ends up getting into it. Presumably Wendy's protests were meant to be seen as symbolic of her repressed middle-class lifestyle, which Alice's sex broke her out of. Erm...
In Empowered, when the girl who will later take up the identity of Ocelotina and her brother kidnap Emp, she gets into the boot of the car with a near-naked Emp and proceeds to grope her, with the dialogue suggesting full-blown forcible digital penetration. This is played totally for laughs at the time and retrospectively in later stories. Similarly the backstory references to Ninjette successfully impersonating the husband of a rival ninja on their wedding night.
In the Revolutionary Girl Utena fanfic, Will of the Rose, Anthy rapes Utena because she is frustrated that they haven't had sex yet (since they are engaged). Anthy's character is completely altered and Utena becomes an Extreme Doormat who stays in an abusive relationship after Wakaba loses interest in their friendship. It should be noted that in this fanfic, Utena agrees to keep fighting off the abusive system (which is mostly male dominated) that Anthy is trapped in.
Ambiguously played in another Degrassi fanfic Bias seems headed toward Manny/Ellie femslash. The chapter started off with some boys coercing Manny into raping Ellie (it was either rape Ellie herself or they rape Ellie). What happened to Ellie is treated like a random drunken encounter and not much else. Neither the male nor female characters involved are given much blame (so far).
This trope was invoked by the audience in the Total Drama Island fanfic Cheer Up Emo Girl. Bridgette is raped by a female OC named Brittney, and it was intended to be taken as seriously as male-on-female rape. However, every single review that referenced to that scene called it hot, and suggested a threesome take place between Bridgette, Brittney, and Bridgette's then-boyfriend. This resulted in a rather scathing author's note at the beginning of the next chapter, lashing out at the people who wrote this.
Full House fanfiction "The girls get it on" features a bizarre scene where Kimmy Gibbler drugs and rapes Rebecca Donaldson.
One (softcore) example from The Stewardesses 3-D: The chief stewardess aggressively puts the moves on one of the junior ones, to which she yields. Later, a male character reveals that his (also male) boss extracted sexual favors from him in return for promotion, leaving him permanently embittered. Moral: Lesbian sexual harassment is fun and sexy; gay male sexual harassment is a soul-blighting trauma.
It's hard to tell if the crazed teenage dominatrix trying to rape another girl in Blood Mask: The Possession of Nicole Lameroux is being Played for Laughs or not.
Same goes for the similar sequence in The Cook.
The main character raping another woman with a crowbar (don't worry, she put a condom on it) in Johnny Sunshine Maximum Violence is played for dark laughs.
Vince, the Depraved Bisexual of Where The Truth Lies, drugs the film's heroine, reporter Karen O'Connor (Alison Lohman) and then arranges for Alice, an aspiring young singer he's training (and who, yes, dresses like Alice from Alice In Wonderland), to have sex with Karen while Karen is stoned out of her mind and unable to think clearly. When Karen wakes up in the morning, completely naked and humiliated, even more so when Vince shows off the pictures of her drug induced tryst (which he intends to use to blackmail her), Vince has the nerve to insinuate that it was no big deal - he even jokes about how Alice couldn't get her pregnant! The film doesn't really focus on it much in the final half but Karen is clearly not happy about what happened.
Mugglenet.com, a Harry Potter fansite, has a section for editorials about shipping. The submission rules indicate that essays about particularly squicky pairings would be turned away, including those containing incest, bestiality, and underage characters with adults. Fair enough. Except that one essay made a case for Luna x Trelawney. Apparently that doesn't count under the very clear "no underage characters with adult characters" rule, somehow?
In The Big U by Neal Stephenson, when the male college students drug Sara and try to engage in sexual activity it's rape, but when her female friend rescues her from them and then engages in sexual activity with the same drugged individual, it's for the best.
In the anthology Blood Sisters: Lesbian Vampire Tales a female character is raped and "turned" by a female vampire. The rape experiences gives her the newfound confidence to pursue her mortal love interest and lead a happier life. Possibly also an example of Sex as Rite-of-Passage, except substitute "rape" for "sex".
Kushiel's Legacy has a complicated version: Phedre informs the reader that rape is an unforgivable act of treason in her culture. Yet when Melisande drugs her and commits sex acts that could arguably be rape before selling her into slavery this act is never considered rape despite a cultural understanding that both men and women can be sexually dominant and powerful. It becomes gray since Phedre is a professional submissive, and was under contract to Melisande. Melisande did honor the letter of the contract, including the safe word, and knew damn well Phedre was a trained spy, working for her enemy, and Phedre does obviously views what happened as a violation despite no using her safeword, but she also doesn't brush it off because of Melisande's gender.
In the book The Queen's Gambit, the preteen protagonist is nearly raped by her large black roommate who had been working to gain her trust for weeks. Later she calls on this person to help her get her life back in order after becoming a drug-addicted mess thanks to her horrific childhood, with zero mention made of the rape.
John Kennedy Toole's A Confederacy of Dunces (which was written in the early 1960s but not published until 1980, after Toole's death) has as one of its secondary characters Lana Lee, an ill-tempered female burlesque house owner in New Orleans. A Politically Incorrect Villain, she is (among other things) intensely homophobic and is constantly complaining about "fairies and dykes" showing up in the news. At the climax of the novel, Lee is arrested after trying to bribe an undercover cop with a pornographic picture and thrown into a holding cell with three "butch" lesbians. Although the scene cuts away just before anything truly nasty can happen, it is clear beyond a shadow of a doubt that Lee is gang-raped by the trio, thus in effect becoming a lesbian herself.
Live Action TV
In The L Word, after Tina discovers Bette's infidelity, Bette rapes her. This never becomes an issue; the problem is still that Bette cheated.
In an episode of What Would You Do?, bystanders react much less strongly to women putting other women through a sexually humiliating hazing ritual than to men putting other men through a sexually humiliating hazing ritual.
One of the few areas where bookers generally seem ahead of the fan base, usually. For example, Eric Bischoff was treated as a horrible person for trying to arrange this situation on Stephanie McMahon. Dawn Marie was also portrayed as a horrible person for trying to force a Scarpia Ultimatum on Torrie Wison but while the crowd gave Dawn plenty of boos they also booed when denied footage of how far she got by Torrie's father.
The original version of The Vagina Monologues contained an extremely controversial piece about a young girl who was seduced by an older woman, who, regardless of the girl's mental state (some productions say she was already drunk, others change it so she wasn't) and the issue of her consent (she's positive about the experience for the entirety of the piece) is still statutory rape, even when the girl is aged up from 13 to 16 in some productions. The original included the line "if it was rape, it was a good rape", and while later versions removed that line the piece itself is still highly controversial.
Embric of Wulfhammer's Castle , which is especially jarring as the Duchess reacts to all the other sexual assaults and Abhorrent Admirers inflicted on her with horror, but describes this assault in erotic, titillating terms as she recounts it to her maid, who is openly aroused by the tale. The game tries to present some mitigating factors (it took place in a dream where desires are more magnified, the rapist is explicitly Neutral Evil), but the end result is that the Duchess is raped and still has no hesitation to enter a relationship with her.
Going hand-in-hand with this trope is Greyghast, who is treated as a Complete Monster whose sexual inclinations toward her were so abhorrent as to be cut away from and implied, rather than made explicit like all of her encounters with women, consensual or otherwise.
Felicity Flint doesn't always wait for consent. At least one of her victims later slid right into the Loving Force trope.