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Online Safety Act 2023 and Ofcom
For a UK-facing adult site the Online Safety Act is the whole story. Under Part 5, any service publishing pornographic content must ensure children are not normally able to encounter it, using highly effective age assurance; the duties became enforceable in July 2025 with Ofcom as regulator. Ofcom guidance treats open banking, photo-ID matching, facial age estimation, mobile-operator age checks, credit-card checks and digital identity wallets as capable of being highly effective. A self-declared "I am over 18" button is explicitly not. Penalties reach 18 million pounds or 10 per cent of qualifying worldwide revenue, and Ofcom can also seek business-disruption measures against payment and advertising partners or ISP-level blocking.
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Payments and card-scheme registration
Stripe and PayPal do not permit adult content. UK operators work with CCBill, Verotel, SegPay and Epoch; Verotel and SegPay hold EU-facing structures that simplify settlement in GBP and EUR. Every UK card payment needs strong customer authentication through 3-D Secure 2, and adult merchants must additionally be registered under the Visa and Mastercard specialty programmes. Expect a rolling reserve and a higher discount rate, and price the product with that built in rather than discovering it in month two. Crypto checkout covers the tail, not the core.
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Languages for the UK market
English first, with Russian for the London and Home Counties audience. Polish, Romanian and Ukrainian are frequently worth adding depending on the segment. We localise copy, legal pages, SEO and support separately per language rather than running one page through a translator: Google treats a weak translated duplicate as thin content, and Ofcom-facing legal text has to be correct in every language you publish, not only in English.
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Hosting and age-assurance data
Hosting in the UK or the EEA keeps latency low and keeps you inside a data-protection regime the ICO recognises. The sensitive part is the age-assurance data itself: under UK GDPR the defensible position is to store no identity documents at all. Use a third-party verifier that returns a yes or no token, keep the token and a timestamp, and log nothing further. That is both what the ICO expects and the cheapest thing to defend if you are ever asked to explain your data model.