Does Substack allow NSFW content? Erotica, nudity and the 18+ label

Substack allows more NSFW content than most platforms, but less than its reputation suggests. Its Content Guidelines allow erotic literature and nudity for artistic, journalistic or related purposes. They do not allow sexually explicit visual material made purely to arouse, or anything sexually exploitative.

The rule draws its line between words and images, and between art and gratification. An erotic short story is allowed. An explicit image whose only purpose is sexual is not. A nude photograph in a piece of art criticism or journalism is allowed. A nude profile picture is not.

Since late 2025 there is a second layer for readers in the UK and Australia, where online safety laws require age checks for adult material. This page sets out both layers, how discovery and filters work, how payments affect paid publications, and what that means for adult game devlogs. It describes Substack’s published rules as they stood on 17 October 2026.

Key points

• Erotic writing is allowed. The Content Guidelines say so directly.
• Nudity is allowed for artistic or journalistic purposes. It is not allowed in profile images.
• Explicit images for gratification are not allowed. Nor is sexually exploitative content.
• Explicit content may be kept out of discovery. Search and substack.com are named.
• UK and Australian readers face age checks. Substack asks writers to label adult material 18+.
• Readers can blur explicit content. A setting called “Filter explicit content” does it.
• Payments run through Stripe. Stripe restricts some adult businesses.

What Substack’s guidelines say

The rule is in Substack’s Content Guidelines, which say they were last updated on 29 September 2026. It sits in a short section about sexually explicit content, and it has four parts.

What is not allowed. Substack excludes explicit adult material and sexually exploitative content, “including any visual depictions of sexual acts for the sole purpose of sexual gratification”. The guidelines add that “We strictly prohibit sexualized portrayals of minors”, and that this applies to anyone who appears to be a minor, to synthetic content and to content carrying age disclaimers.

What is allowed. “We do allow depictions of nudity for artistic, journalistic, or related purposes”, the guidelines say, along with erotic literature.

Profile images. “we have a strict no nudity policy for profile images.”

Discovery. “We may hide or remove explicit content from Substack’s discovery features, including search” and substack.com.

Read together, the rules give four tiers.

The guidelines also ban non-consensual intimate imagery, including synthetic or AI-generated images, and threats to share it.

Words and images: where the line falls

The guideline is written around “visual depictions”. That word choice is what makes Substack unusual among large platforms.

Most platforms we have covered treat explicit text and explicit images alike. Pinterest, for example, names “descriptions” alongside depictions in its ban. Substack instead allows erotic literature outright and reserves its prohibition for visual material whose sole purpose is sexual gratification.

The “sole purpose” test is the other important feature. An image is not excluded simply because it is explicit or contains nudity. It is excluded if gratification is the whole of its purpose. Nudity in a review of an exhibition, in reporting, or in a work of art falls under the “artistic, journalistic, or related purposes” allowance.

This reflects the platform’s stated approach. In a 2021 post on how it makes moderation decisions, Substack said the rule “does not include artistic expressions of nudity and erotica”, and that it would “err on the side of being permissive” while excluding only the outright case.

What the guidelines do not provide is a worked example. Where an illustrated erotic story crosses from artistic to gratification, the text does not say.

The 18+ label and age checks in the UK and Australia

Substack’s global rules are the same for everyone. Two national laws add a layer for readers in particular countries.

Substack’s help centre article Substack 18+ Content policy explains the UK side. It opens by saying Substack “supports a wide range of writing and creative expression, including material intended for adult audiences”, and then sets out the categories the UK Online Safety Act requires to be marked 18+ and placed behind age verification. Sexually explicit content is first on the list. The rest include content encouraging suicide, self-harm or eating disorders, bullying, hate content and serious violence.

Its instruction to writers is direct: “Writers who publish such material should ensure that their content is appropriately labelled as 18+.”

The article also says Substack is still refining its labelling system, and that a writer who thinks content was mislabelled can ask the Standards and Enforcement team for a manual review. Its last line is a reminder that the global Content Guidelines still apply to everyone.

A second article, I’m being asked to verify my age, covers readers. It says new regulations in some regions require age verification, names the UK and Australian Online Safety Acts, and says readers based there “can unblock restricted content by verifying your age”. It lists three alternatives to a selfie or ID check:

1. Adding a credit card as the payment method on a paid subscription.
2. Connecting to Stripe, for readers who also run a paid publication.
3. Deleting the account.

The first two work because a credit card or a verified Stripe account is already a form of age assurance. For how the same idea works on Steam, see Steam age verification for adult games.

Filtering explicit content as a reader

Substack also gives readers a filter of their own. Its help article on hiding explicit images says the setting “Filter explicit content” can be found under Content preferences on the desktop settings page, and under Privacy in the Android app.

Once it is on, “explicit photos and posts will be blurred by default in your Home feed”, with a “Show anyway” option on each.

This is separate from the 18+ label. The filter is a reader’s choice about their own feed. The label is a legal requirement for adult material shown to UK readers.

Paid publications and Stripe

Substack’s guidelines point out a constraint that is easy to miss: “Substack’s payments are processed through Stripe, which excludes certain types of businesses”. They refer writers to Stripe’s agreement and its list of restricted businesses.

That matters for anyone planning a paid publication with adult content. Substack’s own rules may allow it, but the payment processor has its own. We cover Stripe’s position in does Stripe allow adult content, and the wider picture in payment processors and adult games.

The safe reading is that a paid erotic fiction newsletter fits Substack’s guidelines, and that a paid publication whose main product is explicit imagery is outside them on two counts.

How Substack enforces the rules

The guidelines give Substack wide latitude. It may remove or hide content that breaks them or impose other restrictions, it has sole authority to interpret and enforce them, and it may update them without notice. It may also consult outside experts.

There is no formal appeals process in the guidelines themselves. The 18+ policy offers a manual review for labelling disputes. The guidelines also warn that reports must be made in good faith, and that repeated misuse of reporting can lead to restrictions on the reporting account.

What this means for adult game developers

Substack is one of the better platforms for an adult game’s newsletter or devlog, because it allows frank writing.

1. Write freely about the game. Discussing its themes, systems and scenes in prose fits the guidelines.
2. Keep explicit art out. Images whose purpose is sexual are not allowed, whatever the surrounding text.
3. Expect less discovery. Posts with nudity may be kept out of search and substack.com.
4. Label for the UK. Anything sexually explicit should carry the 18+ label, and UK and Australian readers will be asked to verify their age.
5. Use a clean profile image. No nudity is allowed there.
6. Link to the store for the game itself. Substack is for writing, not for selling the game.

For the other places a studio can post updates, see does Tumblr allow NSFW content and does Patreon allow NSFW content.

What is still unknown

• Where an image stops being artistic. The guidelines give no examples.
• How 18+ labels are applied in practice. Substack says it is still refining the system.
• How much discovery explicit posts lose. Substack says it “may” hide them, without saying when.
• How the Australian rules differ. We read the UK article in full and the Australian one only by title.

How this page was put together

The rules are quoted from Substack’s Content Guidelines (last updated 29 September 2026) and three of its help centre articles, all read on 17 October 2026. The 18+ policy and the age verification article showed relative update dates, which place them in late 2025 or early 2026. Substack’s 2021 post on moderation is cited for its stated approach, not as the current rule.

The studio does not publish on Substack and has not tested its moderation, and nothing here is a first-hand account of a label, a removal or an appeal. Where the rules used wording this site does not print, the rule has been paraphrased and the source is linked.

This page was written on 17 October 2026 and will be updated when Substack’s guidelines change. To report an error, see the corrections standard.