NSFW games: what the label means on Steam, itch.io and other stores

NSFW stands for “not safe for work”. In games it marks content that you would not want on a screen where other people can see it, which almost always means sexual content and occasionally means graphic violence. An NSFW game is usually an adult game, but NSFW is an informal label, and every store and platform uses its own version of it.

This page explains where the term comes from, how it differs from “adult” and “mature”, and how the main stores and platforms decide what counts.

Key points

• NSFW is a warning label from internet forums, not a rating.
• It overlaps with “adult game” and is a little wider, taking in suggestive games that are not fully explicit.
• Steam uses content descriptors and hides “Adult Only Sexual Content” by default.
• itch.io combines a “sensitive material” setting with adult tags.
• Patreon, Newgrounds and DLsite each have their own adult category.

Where the term comes from

NSFW started as a courtesy on early internet forums: a note on a link warning that opening it at the office could be embarrassing. Citations collected by the word researcher Barry Popik show “not safe for work” in forum posts in 2002 and the abbreviation NSFW in print by April 2003. Platforms such as Reddit later turned it into a formal flag that blurs or hides a post until the reader chooses to see it, as IONOS’s explainer describes.

Games inherited the term from those communities. Players used “NSFW” for any game they would not play in front of colleagues, and the label stuck.

NSFW, adult and mature

The three words overlap, and the differences matter when you are trying to find, avoid or sell a particular kind of game.

In practice NSFW takes in two groups. The first is adult games proper, with explicit content. The second is suggestive games: fan-service titles with partial nudity, revealing outfits or innuendo, which Japanese fans call ecchi. These are sometimes sold on consoles with a mature rating, and players still call them NSFW.

When a store says “NSFW”, read its definition. The examples below show how much they differ.

How Steam labels it

Steam does not have a section called NSFW. It uses content descriptors that developers declare when they submit a game, and customers choose which descriptors to see.

Valve introduced these filters in September 2018, saying, as Game Developer reported, that “the context of how content is presented is important” and that developers would describe what is in their games. In store preferences today there are five mature content categories:

• General Mature Content
• Frequent Violence or Gore
• Some Nudity or Sexual Content
• Frequent Nudity or Sexual Content
• Adult Only Sexual Content

The first four are visible by default. “Adult Only Sexual Content”, described as sexual content that is explicit or graphic and intended for adults only, is unchecked by default, and turning it on means affirming that you are at least 18. Games with that descriptor are the ones players mean when they talk about NSFW games on Steam.

Players add a second layer. Steam lets users tag games, and “NSFW” is a common user tag. It is applied by the community and is less precise than the descriptors.

Steam’s publishing rules also say what cannot carry any label: adult content that is not properly labelled and age-gated, sexually explicit images of real people, and, since July 2025, content that may break its payment processors’ rules. What happened when that rule arrived is in the timeline of NSFW games removed from Steam and itch.io.

To change these settings, see how to see adult games on Steam.

How itch.io labels it

itch.io uses two signals together. In its July 2025 announcement, it defined “adult NSFW content” as pages that have the creator setting “Contains sensitive material” ticked and also carry tags suggesting adult material, such as mature, lewd, erotic, fetish or eroge.

Pages that meet that definition are filtered from browse and search for people who have not chosen to see adult content. After July 2025 itch.io also deindexed paid adult pages for a time while it dealt with its payment processors.

itch.io’s creator FAQ adds the limits that apply no matter how a page is labelled. Fictional and illustrated adult content is generally allowed if it is legal, and a list of themes, including non-consensual content and incest, cannot be sold.

How other platforms label it

Patreon

Patreon does not use the word NSFW in its rules. It has an Adult/18+ category for creators, with rules revised in March 2026. Creators mark their page as 18+, subscribers must be adults, and illustrated characters must be unmistakably adults.

Newgrounds

Newgrounds, one of the oldest homes of free browser games, rates everything on a four-step scale: E for everyone, T for teen, M for mature and A for adult. As Common Sense Media describes, creators declare the level of sexual content, violence and language when they upload, and the rating follows from those answers. Users can filter by rating.

DLsite

DLsite, the main Japanese store for self-published work, separates all-ages works from adult works, which Japanese stores label R18. Customers choose which side of the store they are browsing.

Nutaku

Nutaku is an adult platform by design, so the whole catalogue is NSFW. It also keeps an all-ages section.

How to tell from a store page

If you want to know whether a game is NSFW before you play it, look for these signs:

1. The content descriptor or rating. On Steam, “Adult Only Sexual Content” means explicit. “Some Nudity or Sexual Content” means it is not.
2. The developer’s content description. Steam requires one for mature content. Read it.
3. An all-ages or adult version. Many games exist in both, and some offer a separate patch that restores adult content.
4. The platform. A game on a console or a mobile app store is not explicit, because those stores do not allow it.
5. The tags. Community tags are useful for finding themes, but they are applied by players, not checked by the store.

Why the labels matter now

Until 2025 the main purpose of NSFW labels was to help players find or avoid content. Since then they have also decided what can be sold. Payment companies set the limits, and stores enforce them through these same labels and descriptors. A game labelled correctly can still be removed; a game labelled wrongly is removed faster.

For developers, that means labelling is part of compliance, not just courtesy. For players, it means a store’s NSFW filter is the first place a policy change shows up.

NSFW and search engines

Search engines draw their own NSFW line. Google’s SafeSearch setting filters explicit results, and Google’s guidelines for explicit content ask site owners to mark adult pages and recommend keeping explicit content on its own subdomain or directory, so that the rest of a site is not filtered with it.

For players, this means a search for an NSFW game can return very different results depending on SafeSearch. For developers and studios, it is one reason to keep a main website safe for work and put explicit material somewhere separate.

How this page was put together

The history of the term comes from published word research. The store labels come from each platform’s own documentation or announcements, and from reports that quote them, all listed under Sources. This page does not rely on first-hand testing of the filters.

It was written on 3 October 2026. Store settings change, so this page will be updated when they do. To report an error, see the corrections standard.