Some of y'all have given good info, most of y'all are confused... Like Eazy E said, "Im'ma break it down just to tell a lil story, straight out the box, from the gangsta category...
In the early 80's, there were various gangs/cliques that formed in the areas of Santa Monica, Venice, Hollywood, West Hollywood, and around the Wilshire area. They were a mix of punkers and stoners, and many took on some of the ese/cholo styles, like clothes and graffiti. These gangs/cliques included, but are not limited to, LADS, SxR, Suicidal Tendencies, and Drunx (too many to name here). Racially, this is mostly a white-boy scene, but there were often Black and Latino dudes that were included. These groups formed various beefs with each other and fought all over the areas of Santa Monica, Venice, Hollywood, West Hollywood, and the Wilshire area. No guns were involved, rarely were weapons involved at all... mainly fights at parties or parks.
From what I understand, the Drunx broke up in about 1983 and some started to call themselves Poserz 13 and others started calling themselves Winoz 12. The 13 reflected marijuana, not Sureno; 13 had not even really started being used by eses at that time as Sureno, but many eses, stoners, and others did use 13 to represent marijuana, rifa, etc. M is the 13th letter of the alphabet. Some used "12"(the 12th letter), which was for "liquor".
The gang that is now called W/S Poserz 13 has gone through a few phases over years as the scenes changed, but is still essentially the same group that started in the mid/early-80s. The first incarnation of Poserz was based in Santa Monica/Venice area around a club called 321. The original members were Black dudes that kicked it there, but lived in the areas of Ladera Heights and Windsor Hills, and Westchester, and primarily went to Westchester and Palisades high schools. They were not eses, Crips/Bloods, stoners, mods, punkers, or dancers; really they were a mix of all that. Like I said, most of their actual banging style was derived from cholos/eses: in some ways their dress style echoed cholos, and their graffiti style definitely did (like everyone else LOL). But the dress style was also heavily influenced by the mods, skins, and punkers styles from that time as well; this was the scene that that started from. They were not Crips/Bloods, but since most of the Poserz were Black, they came from families, areas, and backgrounds where this was familiar to them, and were influenced there as well.
There were various dance groups/crews that started to form in early-mid 85 that were centered around the dances/parties that were thrown mostly by Ultra Wave. Some of the Poserz could dance, and may have doubled as members of certain crews, but Poserz itself was never a dance crew. However, they did have their own dance that they were know for called "the Poser" that became popular at many of the early Ultra Wave functions. A few other cliques/gangs began to form within this dance/party scene, such as KODs (Kingz of Drag), SJX (Sex Jerx, started as Prep Jerks at Pali and Washington High Schools), W/S Crazies, One Way Loverz, SxD (Skate & Destroy), W/S PSE (Posse), and many others (too many to name here). By 87-early 88, as the mod/punk/stoner/skins style began to fade, hip-hop and Crip/Blood styles became a bigger influence in this so-called "Trendy" scene.
Later on, other gangs formed... The KODs and Sex Jerx had become Crips by 89 and had completely dropped all ese elements from their banging style. The Winoz (WNZ) seemed to have fallen off the map for a few years, but came back in the late 80's-early-90's calling themselves SCW (South Central Winoz) and were Blood affiliated. Another gang started in the late 80's-early-90's in Inglewood called Mobsterz (MSZ)and were also Blood-affiliated. (Note: The MSZ and SCW [Bloods] cliqued up with the KODs [Crips] to fight the SJX, PSE, and PRZ, weenie ass move IMO). Other gangs during this era included Weirdoz, Pervertz, EWF, MVP, DOM, and others (too many to name here). Many tagger crews had graduated to gang banging and became part of this scene, such as NBT and KWS. As of today, all of these "Trendy" Black gangs have broken up/faded away because either 1) core individual members stopped banging, went to jail, or died, 2) became Crip/Blood sets of their own, or 3) started claiming the dominant gang that was in their area or school. The only exception to this (that I can think of) is W/S Poserz 13, who became eses and bang Sureno to this day. Also, I think that they are the only Sureno gang that was actually started by Black dudes.
PRZ – eses still banging 13
SCW - faded out, probably most claim Bloods now, DLB or ?
KOD – faded out, some may have become 60s, some may have become MFGC, or BYSH…
MSZ – faded out , probably most claim Bloods now, IFG or ?
Weirdoz – still exist on some level in Inglewood as Weirdoz Blood Gang, many may claim Center Park or Crenshaw Mafia…
EWF – faded out, some probably claim some kind of Blood set…
MVP – became Crips (MVPGC) for a while in the early 90s then faded out, some probably claim other gangs now…
DOM – became Darc Side 40s
NBT – still banging actively, now known an Trouble Gangsta Crips 51st St
W/S Posse – became Overhill 60s
SJX – still banging actively as Sex Jerx Crips along Normandie, 87th St & 107th St (South Flatz)… the other cliques of SJX (West Flatz, West Side, Desert Flatz) mostly faded out, though many still claim SJX… many stopped actively banging, many died, and many got locked up. A few from West Flatz bang Overhill 60s…
xxx – when you stated:
“Why would u think Sex Jerks was a click of RSC?
They had a click called South Flats in ETG Hood on 87th St.
Apples and Oranges.
RSC is a street gang.
Sex Jerks are a school house click a trendy gang a party crew.”
No Sex Jerx cliques, including the South Flatz, ever had any love for ETG, despite being in what is considered ETG hood. SJX has many dead homies and niggas locked up for years that will tell you that Jerx is a street gang, not a “school house click a trendy gang a party crew,” although like many other gangs, it evolved from that. Go on 87th or 107th and them that right now, good luck to you… The West Flatz Sex Jerx and W/S Posse had a neighborhood-based relationship from day one, so PSE and SJX were like one big set on Deane Ave and 54th St, at Ladera Park, all around that area. W/S Posse became the Overhill 60s, this is why many people have said that Sex Jerx was an RSC clique. When the West Flatz Sex Jerx effectively broke up in the 90s, a few did turn Overhill 60s.