If you want to play, it works like this:
1. Visit the master list, select your favorite 100
2. Post your favorite 100 behind a cut in your LJ (or if you can’t pick 100, as many as you can without going over)
3. Your f-list’s job is to write you “comment pr0n” for your favorites.

Abuse (sexual, emotional, and/or violent childhood abuse; past abusive relationships; character A's abuse drives character B into arms of character C; the wounded child as an adult archetype)
Abduction as seduction (beloved captives)
Age differences (e.g., older man/younger man pairing)
Amazons and strong women (warrior women; women as soldiers, law enforcement figures, or leaders; goddesses; tough, butch, or muscled women; lesbians or dykes; quasi-masculine characteristics in general, such as a boyish body type: slim, athletic, and small-breasted; forcefulness or brusqueness)
Anal sex (face to face, from behind, bottom riding top; standing; bent over desk; gay or straight; girl-on-boy with strap-on; girl-on-girl with strap-on)
Animalistic behaviors and characteristics, dominant (snarling; sniffing; scent-marking or biting; other claiming acts; territoriality; predatory stalking; cuffing; forcing the partner's neck down; claws and other features)
Animalistic behaviors and characteristics, submissive (feral characters or behavior; domesticated pet behavior such as sitting at owner's foot and cheeking their thigh; purring; licking; characters objectified as animals, e.g., ponyboys)
Anonymous sex (clubbing; glory-holes; alley sex; alien fertility rituals; one-night stands)
Asphyxiation (asphyxiophilia; autoerotic asphyxiation; scarfing; choking; breath play)
Auctions (slave or slave charity)
Bad boys (punks, rebels; see also Rogues)
Bad girls (dirty girls; naughty schoolgirls; femme fatales)
BDSM
Begging or offering (begging or pleading for mercy, for sexual release, to be taken; a character offering himself; neediness)
Bisexuality
Biting (marking, nipping, chewing)
Blood (fetishization of wounds; blood-play; blood as lube; vampirism)
Blow-jobs (oral sex, fellatio)
Bondage
Bottoming
Boys (pretty boys; bishounen/bishonen; boyish types; pocket-sized cuties; puppies; Persian Boy characters; houseboys or stable-boys; toyboys)
Bruises and other wounds
Canon (canon elements/canonicity heightens characterization or scenario)
Childish characters (brats; little princesses)
Claiming or establishing ownership (private or public; by gesture, word, or ritual; with sex; with a collar and leash; with scent-marking or by biting)
Collars (slave)
Coming in or on one's partner (in ass or mouth; in hair; on body; on face, i.e., facial)
Conditioning (taming or breaking a character; training; brainwashing; Stockholm syndrome)
Crying, sobbing (erotic and non-erotic)
Cunnilingus
Daddy themes (fetishization and role-play; difficult father-son relationships; sugar daddies; paternalism in general)
Damsel in distress scenarios (danger and rescue; damsel character need not be female)
Deep-throating
Discipline or punishment
Discomfort during sex (rough edge of a table as counterpoint to pleasure; cold stone versus hot flesh; position is uncomfortable at first but then becomes perfect; penetration is painful, then pleasurable)
Disorders (phobias; neuroses; obsessive-compulsive disorder; see also Insanity; Emotional themes)
Dominance and submission (See also Submission; Servitude; Master and slave, etc)
Emotional themes, emo-kink (angst; wallows; darkfic; emotional damage; psychological trauma; tragic pasts; broken characters; guilt and shame; mental instability; sadness and grief; abandonment or fear of same; characters who can't go home again; fear in general; nightmares; loneliness; broken-heartedness; failure; insecurity; self-hatred; self-mutilation such as secret cutting; suicide; see also Insanity)
Exposure (with or without eroticism; feeling physically exposed, such as with legs open; a woman's shirt being opened to expose her breasts; characters being forced to undress in public; someone opening a door on people having sex)
Face-fucking (blow-job)
Fantasies (shared or solitary; role-playing)
Feminine terms used for males (e.g., calling a man a bitch, calling his ass a pussy; using condescending endearments such as honey or precious)
Gags (ball-gags, scarves, mouth bits, etc)
Geeks and nebbishes (Peter Parker or Clark Kent characters; computer geeks; lab rats; nerds; intellectuals; personal secretaries; beta males; sidekicks; men in glasses; oddballs and eccentrics)
Girls (dancing girls; cat-girls; schoolgirls; bishoujo; magical girls; cheerleaders; see also Bad Girls; Good girls)
Good boys (law enforcement figures; gentlemen; characters who prompt a desire to corrupt or provoke them, or to get them dirty; priests; prim schoolteachers; angels; nice guys; virtue and nobility in general)
Good girls (nice girls; daddy's girls; schoolmarms; nuns)
Grunge (dirty and sweaty, needing a shower; actual mud/dirt elements in a sex scene)
Guns and gun-play (guns as fetish objects; gun-battles as flirting or foreplay; guns used for sexual penetration; games of Russian Roulette; see also Military fetishization)
Humiliation (erotic or non-erotic)
Humor (funny banter, screwball comedy, etc)
Humor as a mask (characters who hide pain behind humor)
Hurt/comfort (emotional and/or physical, including torture of all kinds and degrees, and any form of caretaking)
Ice princesses, snow queens (cold characters who may or may not succumb to melting; need not be female)
Immobilization and/or helplessness
Imprisonment, erotic (cages, cells, closets, coffins, etc)
Incest (including brother/sister complex)
Insanity (involuntary or false committal; characters appearing insane when their beliefs or fears are real; sedation and restraints; asylums; dementia; therapy)
Inelligence (quick wit; street smarts; Machiavellian cleverness; Sherlock Holmesian deductive powers; geniuses; experts; criminal masterminds; see also Special powers and skills; Geeks and nebbishes)
Knives and knife-play
Lesbians or dykes (includes lesbianism as erotica for men)
Love/hate relationship
Make-up and/or nail polish on men (see also Gender themes)
Masochism
Messiness and markers of arousal (mussed hair; flushed cheeks; swollen mouth; displaying bite marks or hickeys; clothes in disarray; sprawling; come-spattered skin)
Mindfuck, mindgames
Names and address (endearments: sweetheart, honey, mine; nicknames: chief, kid, sport; terms that assert power: boy, cunt; insulting terms that may hide some affection: monkey-boy, Your Worshipfulness, you big furry oaf; using someone's name as a sign of intimacy; using only formal modes of address: Sir, Major)
Noise (screaming or yelling during sex; whimpering or sobbing; purring, growling; slurping or moaning enthusiastically during blow-jobs)
Non-consensual or semi-consensual sex (sexual extortion; bribery; reluctant or ambivalent partner; bondage and struggle; no means yes; other consent issues)
Oral fixation or fetishization (lips, tongue, or whole mouth; french-kissing; licking; oral displays using food or beer bottles; smoking cigarettes, cigars, or pipes; biting or chewing one's lip(s))
Pain (with or without pleasure/endorphins)
Physical responses (face or ears burning; little hairs lifting on the scalp or neck; gut tightening; pulse quickening or missing a beat; lashes fluttering or lids growing heavy; mouth coming open; dick or pussy throbbing)
Power issues (inequities in beauty, rank, or class; power games; BDSM; power reversals; sheikhs, sultans, princes, and other royal figures; teacher/student pairings; magical powers; abuse of power; blackmail; romantic slavery; liege/lord pairings; issues of respect; sexual scenarios such as a dominant character giving his partner to others to use, or a character kneeling beneath a desk and blowing someone who's on the phone)
Predator/prey pairings
Prison scenarios (prison rape and/or protection; cruel guards; punishment; hard labor; deprivation; prisoners of war; camps and barracks; false imprisonment)
Prostitutes (call-girls and hookers; rent boys and hustlers; escorts; paying one's way through school with sideline hooking; juvenile past on the streets)
Pushy bottom
Rape (single assailant; gang rape; partner rape)
Restraint (pinning someone down; pushing someone's arm up behind their back during sex; covering or clasping someone's hands to prevent movement)
Restraints (handcuffs, leather ties, chains, etc)
Reversal of role or fortune (loss of love, power, rank, etc; hunter becomes prey, master becomes slave; a strong character is made weak; role-reversal games; Flowers for Algernon scenario)
Rough sex (quick and dirty sex; hate or grudge sex; angry sex; fighting/wrestling; jackhammer fucking; sex with no or little lube)
Sadism or sadomasochism
Sexual appetite or excess (hypersexuality, i.e., high sex drive; sex addiction or compulsive behavior; short/no refractory period; multiple orgasms; multiple partners; indiscriminate sex or sluttishness)
smies or laughing
Snark
Spanking (over the knee or lap, etc)
Striptease
Submission (obedience; submissive behaviors such as boot kissing, crawling, keeping one's eyes lowered, or kneeling for master; believing in cultural dictates of submissive behavior; abasement in general)
Swallowing (come)
Temperamental personalities (driven or obsessed; hot-tempered or testy; moody; misanthropic or bitter; abrasive)
Tentacle sex
Topping
Undressing (undressing in front of someone for the first time; one character undressing another; fumbling clumsily to get undressed; stripteases)
Urgency for sex (begging to suck cock; desperate to fuck; greedy bottom)
Violent and dark natures (sadists; assassins and murderers; sociopaths who make twisted, scary displays of affection, conflating love and violence; criminals and villains in general; characters who are ruthless, merciless, casually vengeful; soulless demons or vampires; monsters in general)
Vulnerability
Well-fucked (being fucked out; fuck-dazed; sated and sleepy; wrecked; softened and debauched)