Dismissed Gender

Situations where a trope involves a character of a gender different than usual, making the trope either more accepted by the audience or rationalizing why the characters don't react in the usual way. Interestingly, this is useful so fans or writers can rationalize something away that they've been taught is otherwise unfashionable to tolerate without actually changing the underlying premise.

Related to Always Female / Always Male (except this time it isn't). Reversing the gender of characters in a story to explore how things might be different is in Gender Flip.

Not to be confused with Men Are the Expendable Gender or Disposable Woman.

Dismissing the Males

 * The Hard-Drinking Party Girl, who, no matter how gropey and lecherous, never makes girls uncomfortable in compromising situations.
 * A straight woman falling for a gay man and attempting to change him is admissible, if a little pathetic. A man doing the same to a lesbian would be distinctly unfunny.
 * Well, there is Chasing Amy, although she turns out to be a bisexual anyway.
 * The Sandra Bullock comedy While You Were Sleeping was originally written with a man pretending to be the fiance of a woman in a coma, but the producers decided to swap the gender roles when it came off as a little too predatory.
 * Bludgeoning Angel Dokuro-chan, a series about a female angel who repeatedly kills a young male high school student in blood-splatteringly gory ways, then brings him back to life each time, only for him to suffer another painful death a few minutes later. It's a comedy.
 * Majin Tantei Nougami Neuro is about as close as a gender reverse of that relationship can get. The male demon is physically abusive towards the girl lead, who does come to treat this as affection. However, he never actually damages her, and their relationship lacks the sexual (and arguable the romantic) undertones in BAD (Dokuro's something of a tease, cute, and a nice companion when she's not brutally slaughtering Sakura). It also helps that Neuro's demonic nature is lampshaded constantly, making it less "male abuses female" and more "demon abuses female".
 * In Video Games, women in skimpy clothing are often used as rewards, most notably the Metroid series. On the other hand, a man wearing skimpy clothing is regarded as Nightmare Fuel by most gamers (since the majority of gamers are straight men); one particularly infamous example of this "reward" can be found in La-Mulana, in which
 * The Lunar series features 'bromides' - collectible items that serve little purpose other than offering eye-candy of female characters. Lunar 2: Eternal Blue Complete, the sequel, includes bromides for some male characters as well...including a most disturbing one of Borgan, a fat and ugly male villain.
 * A rather amusing example appears in Xenosaga III, where the player can unlock swimsuit outfits for all of the playable characters. While the girls, Shion and KOS-MOS, look notably attractive and MOMO looks... cute... some of the outfits for the male characters include an old-timey striped bathing suit, a mankini, and a disturbingly revealing snorkeling outfit.
 * Poked at by the developers and some of the artists of Katawa Shoujo: some dakimakura-style drawings were released of some of the female leads, to much applause. The two released for the Nurse and Art Teacher (who were male)...not so much.
 * South Park summed up female pedophilia succinctly in "Miss Teacher Bangs a Boy".

Dismissing the Females

 * The Bifauxnen, who writers can use if they ever need a male character without invoking any of the kneejerk tropes shy males would have.
 * Fanservice utilizing the Wholesome Crossdresser
 * Both Boys Love and Yuri Genre elements may be used as Fan Service, to include "nonthreatening" romance in the series. If the show is made entirely of either one, you'll probably have a "nonthreatening" character and a "predatory" character.
 * Similarly, fans who writhe at the suspicion of a beloved character having a romantic partner will eagerly accept a gender-reversed (and usually younger) Morality Pet who nonetheless fufills the exact same intended role.
 * Yaoi fandom in particular is infamous for some rather extreme melodrama (specially if it uses Rape as Drama or Victim Falls For Rapist, or one of the Yaoi Guys is a Love Martyr towards the other) that would be more squicky to the audience if it used women instead.
 * A male Token Mini-Moe is a mild example, since it lets you have a male character without any associated sexuality.
 * In Mahou Sensei Negima the ten year Negi is the object of lust of several of his teenage students, a few openly try to seduce him. There would be much more of a stir if the genders were reversed and it was teenage boys crushing on a ten year old girl.
 * Magical Girl Lyrical Nanoha fandom embraced Erio quickly partly because he's a non-threat to any original female character 'shipping, with the exception of the new character Caro who he's clearly 'paired' with from the get go. Yet, she goes into the men's bath to invite him to bathe with her and their two older female teammates. Now, imagine the ruckus that would have happened if it had been a boy inviting a girl into the men's bath...
 * An implausibly attractive 25 year old woman fawning over a younger character can be played for nearly identical humor as the reverse, but comes off much less squicky, as shown in Steel Angel Kurumi.
 * Demonstrated by the Japanese dubbers in Beast Wars, where Airrazor (originally female) was dubbed as a young man. Season Two came around and found the dubbers scrambling like mad to demonstrate that Airrazor and Tigatron had a firm mentor/prodigy relationship—because in the original, the female Airrazor and Tigatron had fallen in love. And on a kid's show, the gay just wouldn't work.

Depends on the Situation

 * Non-Fan Service nudity is more likely to be male since guys will be guys, but Fan Service nudity is more likely to be female, since male fanservice makes straight men uncomfortable.