If intimate images or videos of you are being shared on X (formerly Twitter) without your consent, including deepfakes, X has a built-in report flow for it under the Take It Down Act. It is quick to use, with one catch worth knowing about before you start.
Report the post, step by step
Start on the post itself. Open its menu by tapping the three dots in the top corner of the post, then choose Report.

When X asks What are you reporting?, choose Private or Non-Consensual Content.

On the next screen, Private or Non-Consensual Content, pick the option that matches your situation.

The first option, Report content under the US Take It Down Act, is the direct route for intimate images shared without your consent, deepfakes included. The option about sharing a sexual, nude, or intimate photo or video of you without permission, and the one about a photo or video of you that you do not want on the platform, also apply depending on your case. Choose the closest match, then follow the remaining prompts and submit.
The US-region block, and how to get past it
Here is the catch. X is one of the platforms that, without any real basis, limits this report to people in the United States. If your connection is not resolving from a US IP address, the Take It Down Act report will not open. Instead you will see this:

This restriction is not something the law requires. The Take It Down Act does not actually depend on you living in or being a citizen of the United States. X simply enforces a US-location rule from its own side.
There are two practical ways around it. You can connect through a US VPN so your traffic resolves from a US IP address, which lets the report open normally. Or, if you would rather not deal with that, a third-party removal service that operates from the US can file on your behalf. QayemDigital is one such service.
After you report
X tends to act on valid non-consensual content reports quickly. Keep a record of the post links you reported, in case the same content reappears and you need to report it again. If it is also spreading on other platforms, our guide to removing leaks from Telegram and the Reddit removal guide cover those, and the explainer on the Take It Down Act covers what the law actually requires.