In short
Black Book of Sex is an adults-only casual dating site run by Ambervine Inc, a Delaware company in Newark, Delaware. It began as an Australian adult site and is now used mostly in the UK, then the US and Australia. These pages describe only what the members area actually does, and cite official sources for everything else.
| Operator | Ambervine Inc, Delaware, USA |
|---|---|
| Domain first registered | 4 November 2010 |
| Who it's for | Adults 18+ after something casual |
| Most readers | UK, then the US and Australia |
| Written by | The Black Book of Sex editorial team |
Who runs it
Black Book of Sex is run by Ambervine Inc, a Delaware company, 131 Continental Drive, Suite 305, Newark, DE 19713, USA. The same company is named in the footer of the members area at members.blackbookofsex.com, where accounts, messages and payments are handled.
The members area runs on a shared platform. One member database serves Black Book of Sex and partner sites in the same network, so members of those sites can see and message you, and each profile shows the site its owner joined through. How it works explains what that means in practice.
Where it came from
The domain was first registered on 4 November 2010. By 2018 it was an Australian adult site, and that's where the brand has its history. Today most of the people who find it are in the UK, followed by the US and Australia, so these pages are written in British English for UK readers first, with US and Australian details where they differ, such as where to report a scam.
The name is an old idea: the little black book of names and numbers, kept private. We treat it as advice about discretion rather than a product. There's no diary tool in the members area. Our guide to keeping casual dating private is the closest thing to a manual.
What it is, and what it isn't
Black Book of Sex is a place for consenting adults to find each other for something casual. It is not an escort service, it doesn't arrange meetings, and it doesn't promise that anyone will reply.
| It is | It isn't |
|---|---|
| Adults only, 18 and over | A site for anyone under 18, ever |
| Free to join and browse | Free to read and reply to messages |
| Part of a shared network of partner sites | A closed room only its own members can see |
| Clear that photos are reviewed | A check on what members say about themselves |
The paid side is set out on the prices page.
How these pages are written
The old version of this website had thin, keyword-stuffed pages. These replace them, and they follow a few rules.
- Product facts come from the members area. We describe what the platform does as checked on 16 and 17 October 2026, and nothing more. If a feature isn't confirmed, we don't mention it.
- No numbers we can't stand behind. No member counts, no success rates, no "most popular". Where we quote a figure, such as romance-fraud losses, it comes from the official body that published it.
- No testimonials or invented quotes. Example profiles and messages are labelled as examples.
- Official sources for outside facts. Scam-reporting routes, helplines and laws link to the government body, regulator or charity concerned, listed under each page.
- Dated. Each page shows when it was last checked. Phone numbers and reporting routes change; we recheck them rather than assume.
- Unsigned, for now. Pages carry no personal bylines. We'd rather publish no name than an invented one.
How to check us yourself
You don't have to take our word for any of this. The operator's name appears in the members-area terms, which you can read before joining. The domain's registration date can be checked on ICANN Lookup. And every outside fact on these pages links to its source, so you can see what the source actually says. Our guide to whether Black Book of Sex is legit goes through the rest.
Corrections
If something here is wrong or out of date, tell us through the members help centre; the contact page explains how. We fix factual errors and change the date on the page when we do. For the essentials on one screen, see Black Book of Sex at a glance.
Questions people ask
Who owns Black Book of Sex?
Black Book of Sex is run by Ambervine Inc, a Delaware company at 131 Continental Drive, Suite 305, Newark, DE 19713, USA. The same company is named in the footer of the members area, where accounts, messages and payments are handled, and in the members-area terms, which are governed by Delaware law.
Is Black Book of Sex Australian?
It was. By 2018 the site was an Australian adult site, and Australia is where the brand has its history. Today most of the people who find it are in the UK, followed by the US and Australia, so these pages are written in British English with US and Australian details where they differ.
Who writes these pages?
The Black Book of Sex editorial team. Pages carry no personal bylines for now: we'd rather publish no name than an invented one. Product facts come from the members area as checked on 16 and 17 October 2026, and outside facts link to the government body, regulator or charity concerned.
Does the site have a 'black book' diary tool?
No. There's no diary or notes feature in the members area. The name is advice rather than a product: if you keep notes on people you've met, keep them in a locked app on your own phone. Our guide to keeping casual dating private explains how.
Keep reading
- Casual dating sites in the UK: what you're actually paying forWhat's free, what you pay for, why partner-site members appear, profiles, a first week, meeting, privacy and scams.
- Is Black Book of Sex legit?Who runs it, what's free and paid, what's checked, partner-site sharing, billing, the terms, and a checklist before you pay.
- Keeping casual dating private: your phone, your inbox, your statementStatements, inboxes, lock screens, photos, partner-site sharing, locked notes, your data rights and leaving without loose ends.
- Meeting a casual date safelyChecks before meeting, a check-in plan, the first drink, spiking, consent, sexual health, and what to do if it goes wrong.
Sources
Checked 18 October 2026. Spotted something out of date? Tell us.