Hey everyone 
So I'm kind of an old dog when it comes to anything from nude arts to pornography and over the years I have learned to use several different kinds of phrases (or "tags" as you would call it today), not only to describe the many different shades or categories of the industry, but also to reflect the way those same shades are weighed and measured by society in general.
Anyway, on indexxx it seems some members are a little confused by some of the phrases normally associated with the industry and naturally when I started adding some of the less commonly known phrases it might have confused some of the members, understandably
, so I thought I would just add a list here explaining some of the phrases / tags that I have picked up over the years 
Main categories:
---------------------------
(I have formed most of my definitions on not only the industry but also public opinion, there are a lot of gray areas but these are basically what it comes down to).
- Extremecore (Short tag(s): Xcore, XC)
Covers: Gangbang (4 or more male models on 1 F/M model), Abuse Porn, Bukakke, Blackmail Porn, etc. basically any kind of content featuring degrading behavior towards the model(s).
- Hardcore - (Short tag(s): HC)
Covers: Mutual sexual interaction between members of the opposite sex (max 3 male models on 1 F/M model)
- Midcore (Short tag(s): MC)
Covers: Anything where 1 model is stimulated (one-way stimulation only) by member(s) of the opposite sex, this could be by the use of oral, fingering or by toys.
- Softcore (Short tag(s): SC)
Covers: Both mutual and / or one-way sexual stimulation between female only models of any number, may include all kinds of toys, this category doesn't exist for gay actors, for gays it is pretty much directly to the above categories.
- Solo
Covers: Any kind of mastubation using fingers (or hand) and / or toys, only the model her- / him-self can be involved in the stimulation and no other model can interact with the model while she / he mastubates, otherwise it changes to "Softcore" or if it's the opposite sex it changes to "Midcore".
- Glamor Erotica / Erotica (Short tag(s): GlamE / Erotica)
Covers: This is about showing the beauty of the nude body, but it is also about the more erotic aspects of nude arts, the main difference between "Glamor Erotica" and "Glamor" is that in "Glamor Erotica" the model(s) are allowed to touch their genitals, not in a directly sexual way, such as to simulate mastubation, but to display or bring focus to the genitals and could include things like a female model spreading their labia or pulling their buttcheeks slightly apart.
- Glamor (Short tag(s): Glam)
Covers: Much like the "Glamor Erotica", "Glamor" is about showing the beauty of the nude body, it is basically the good old nude arts and the photographers and videographers are often given way more room to experiment with the media, the models even though often completely nude will not necessarily be displayed in a sexual way, instead a lot of weight will be put on creating an atmosphere, this ofc doesn't mean that it can't be erotic, but it is not necessarily where the emphasis lies, also like mentioned in the "Glamor Erotica" category, to be able to fall into this category the model cannot under any circumstance directly touch their genitals.
Minor Tags:
---------------------------
(These are just some of the known tags, there are ofc many more).
Mov - Movies, Videos, Clips.
Pic - Pictures, Photographs.
Toy - The use of sextoys for mastubation, such as glass dongs, dildos, vibrators, etc.
Obj - The use of miscelanous none-sextoy objects for mastubation, such as penetration with hairbrushes, cucumbers, bananas, etc.
Girl-Girl - Softcore interaction between two or more female models (Also: gg, GG, Soft).
Boy-Girl - Direct hardcore interaction between two or more models of the opposite sex (Also: bg, BG, HC).
Anal - Anal penetration by either cock or sextoy.
AP - Anal Plug / Butt Plug, a "-T" could be added to indicate the more specific anal plug tail (Also: BP).
DP - Double penetration, the simultaneous penetration of both vagina and anus.
DAP - Simultaneous double anal penetration, primarily used for anal penetration with cocks, but may also apply to sextoys.
TAP - Simultaneous triple anal penetration, same factors as DAP.
DPP - Simultaneous Double pussy penetration, primarily used for vaginal penetration with cocks, but may also apply to sextoys.
TPP - Simultaneous Triple pussy penetration, same factors as DPP.
Gang - Gangbang, 4 or more male models on 1 F/M model.
3on1 - 3 F/M models on 1 model of opposite sex, always with one single model in the center role (Also: BBBG, BGGG).
2on1 - 2 F/M models on 1 model of opposite sex, always with one single model in the center role (Also: BBG, BGG).
4Way - 4 models of the same or opposite sex, usually with no single model in the center role (Also: BBBB, BBGG, BGGG, GGGG).
3Way - 3 models of the same or opposite sex, usually with no single model in the center role (Also: BBB, BGG, GGG).
Like mentioned, these are just a few of both the categories and definitions that I have run into over the years and some people might have different opinions and ideas of things, so please feel free to add your thoughts

So I'm kind of an old dog when it comes to anything from nude arts to pornography and over the years I have learned to use several different kinds of phrases (or "tags" as you would call it today), not only to describe the many different shades or categories of the industry, but also to reflect the way those same shades are weighed and measured by society in general.
Anyway, on indexxx it seems some members are a little confused by some of the phrases normally associated with the industry and naturally when I started adding some of the less commonly known phrases it might have confused some of the members, understandably


Main categories:
---------------------------
(I have formed most of my definitions on not only the industry but also public opinion, there are a lot of gray areas but these are basically what it comes down to).
- Extremecore (Short tag(s): Xcore, XC)
Covers: Gangbang (4 or more male models on 1 F/M model), Abuse Porn, Bukakke, Blackmail Porn, etc. basically any kind of content featuring degrading behavior towards the model(s).
- Hardcore - (Short tag(s): HC)
Covers: Mutual sexual interaction between members of the opposite sex (max 3 male models on 1 F/M model)
- Midcore (Short tag(s): MC)
Covers: Anything where 1 model is stimulated (one-way stimulation only) by member(s) of the opposite sex, this could be by the use of oral, fingering or by toys.
- Softcore (Short tag(s): SC)
Covers: Both mutual and / or one-way sexual stimulation between female only models of any number, may include all kinds of toys, this category doesn't exist for gay actors, for gays it is pretty much directly to the above categories.
- Solo
Covers: Any kind of mastubation using fingers (or hand) and / or toys, only the model her- / him-self can be involved in the stimulation and no other model can interact with the model while she / he mastubates, otherwise it changes to "Softcore" or if it's the opposite sex it changes to "Midcore".
- Glamor Erotica / Erotica (Short tag(s): GlamE / Erotica)
Covers: This is about showing the beauty of the nude body, but it is also about the more erotic aspects of nude arts, the main difference between "Glamor Erotica" and "Glamor" is that in "Glamor Erotica" the model(s) are allowed to touch their genitals, not in a directly sexual way, such as to simulate mastubation, but to display or bring focus to the genitals and could include things like a female model spreading their labia or pulling their buttcheeks slightly apart.
- Glamor (Short tag(s): Glam)
Covers: Much like the "Glamor Erotica", "Glamor" is about showing the beauty of the nude body, it is basically the good old nude arts and the photographers and videographers are often given way more room to experiment with the media, the models even though often completely nude will not necessarily be displayed in a sexual way, instead a lot of weight will be put on creating an atmosphere, this ofc doesn't mean that it can't be erotic, but it is not necessarily where the emphasis lies, also like mentioned in the "Glamor Erotica" category, to be able to fall into this category the model cannot under any circumstance directly touch their genitals.
Minor Tags:
---------------------------
(These are just some of the known tags, there are ofc many more).
Mov - Movies, Videos, Clips.
Pic - Pictures, Photographs.
Toy - The use of sextoys for mastubation, such as glass dongs, dildos, vibrators, etc.
Obj - The use of miscelanous none-sextoy objects for mastubation, such as penetration with hairbrushes, cucumbers, bananas, etc.
Girl-Girl - Softcore interaction between two or more female models (Also: gg, GG, Soft).
Boy-Girl - Direct hardcore interaction between two or more models of the opposite sex (Also: bg, BG, HC).
Anal - Anal penetration by either cock or sextoy.
AP - Anal Plug / Butt Plug, a "-T" could be added to indicate the more specific anal plug tail (Also: BP).
DP - Double penetration, the simultaneous penetration of both vagina and anus.
DAP - Simultaneous double anal penetration, primarily used for anal penetration with cocks, but may also apply to sextoys.
TAP - Simultaneous triple anal penetration, same factors as DAP.
DPP - Simultaneous Double pussy penetration, primarily used for vaginal penetration with cocks, but may also apply to sextoys.
TPP - Simultaneous Triple pussy penetration, same factors as DPP.
Gang - Gangbang, 4 or more male models on 1 F/M model.
3on1 - 3 F/M models on 1 model of opposite sex, always with one single model in the center role (Also: BBBG, BGGG).
2on1 - 2 F/M models on 1 model of opposite sex, always with one single model in the center role (Also: BBG, BGG).
4Way - 4 models of the same or opposite sex, usually with no single model in the center role (Also: BBBB, BBGG, BGGG, GGGG).
3Way - 3 models of the same or opposite sex, usually with no single model in the center role (Also: BBB, BGG, GGG).
Like mentioned, these are just a few of both the categories and definitions that I have run into over the years and some people might have different opinions and ideas of things, so please feel free to add your thoughts

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