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Former adult film star Stormy Daniels has said she revealed details about sex with US president Donald Trump to “prove that she was telling the truth” about the alleged affair.

Ms Daniels told BBC Newsnight that her book Full Disclosure, which contains salacious details about the alleged affair, is a “checkmate” over the US president.

In her first interview in the UK since her book was released this week, the 39-year-old said she believes recounting the intimate details are evidence of their alleged encounter.

After describing the president’s genitals as both “usual” and “smaller than average”, Ms Daniels told the BBC that “unless he has had a penis transplant I’m pretty sure that’s a checkmate”.

The former adult film star said she revealed details about sex with Trump “to prove that [she] was telling the truth”, saying she usually “doesn’t make a habit to kiss and tell”.

Asked by presenter Emily Maitlis whether the intimate descriptions of Trump’s penis was part of “truth-telling” or an attempt to embarrass him, she said: “I would never humiliate someone for no reason.”

She said the US president “attacked me first” and that “part of me feels guilty” for publishing details of the alleged encounter, which she claimed took place at a celebrity golf tournament in 2006.

She added: “By recounting every detail, I think it's obvious that I know things that that only someone who had actually experienced and been there would know.

“And I would never have included any of those things, or kiss and tell for lack of a better explanation if it wasn't for the fact that I was being called a liar.”

President Trump has repeatedly denied having an affair with the former adult actress but has admitted that she was paid hush money.

Ms Daniels told BBC Newsnight that she believes people are “quicker to discredit and discount me because I work in the adult business.”

She said that people "for some reason think that because of my job, I'm to be trusted less than someone who is perhaps like a schoolteacher or accountant.”

The 39-year-old said she has received a lot of support from other women, but said women have also been the source of some of the most hurtful comments.

"They think that I am not worth believing or that I’m inhuman because I work in the adult business. My job shouldn’t have anything to do with my character," Ms Daniels said.

Ms Daniels denied that her alleged encounter with the president was anything but consensual, that she “was not offered money” and it “was not prostitution”.

“He mentioned something about a part on a TV show, it was never specifically said ‘hey, if you have sex with me I will give you this’, It wasn’t anything like that,” she added.

“But it was definitely not a #MeToo moment. And that’s another really irritating thing, is when people think that I was either a prostitute or a victim: I was neither.”