Activist: Annie Teriba has quit from a number of campaigning positions after admitting having non-consensual sex while drunk

A leading feminist and gay rights activist at Oxford University has resigned from the students' union after she admitted having sex with someone without their consent.

Annie Teriba, 20, a third-year history and politics student at Wadham College, has been involved in a series of Left-wing campaigns and previously accused other students of promoting 'rape culture'.

However, she has quit a number of political and campaigning positions after admitting: 'I become sexually entitled when I am drunk.'

In a self-flagellating open letter, which she posted online with a 'trigger warning', Miss Teriba said that she had had non-consensual sex at a National Union of Students conference for ethnic minority students, where she was elected the lesbian rights representative.

She wrote: 'I failed to properly establish consent before every act. I apologise sincerely and profoundly for my actions. I should have taken sufficient steps to ensure that everything I did was consensual.

'I should have been more attentive to the person's body language. In failing to clarify that the person consented to our entire encounter, I have caused serious irreparable harm.'

Miss Teriba also revealed that on another occasion, she had 'touched somebody in a sexual manner without their consent' when she was drunk in a nightclub.

She added: 'It is clear that I lack self-awareness and become sexually entitled when I am drunk.'

She announced that she was leaving a string of high-profile campaigning positions - as 'people of colour and racial equality officer' at Wadham, a member of the NUS black students' committee and a leading figure of the National Campaign Against Fees and Cuts.

Student: Miss Teriba, 20, studies at Wadham College, pictured, whose alumni include Christopher Wren

The student, who was a star debater at her East London school, also quit as editor of No HeterOx, a magazine 'for Oxford's queer and trans voices'.

Miss Teriba made a string of pledges in her open letter - including a vow to stay away from the NUS because she threatened the safety of other students, and a promise to 'read zines and other material' to teach herself about sexual consent.

Since starting at Oxford, Miss Teriba - a former student at Coopers' Company & Coborn School in Upminster, has carved out a position as one of the university's most prominent radical activists.

Earlier this year, she led the campaign to remove a statue of Cecil Rhodes - a white supremacist who set up the famed Rhodes Scholarships - from an Oxford college.

Radical: Miss Teriba was editor of No HeterOx, a Left-wing magazine which courted controversy by purging white gay men

She told Sky News that the university was 'built off the back of exploiting labour and the colonial project', adding: 'There's a violence to having to walk past the statue every day on the way to your lectures.'

On another occasion, she made a student cry by berating her over an Arabian Nights-themed party which she claimed would 'produce quite racist caricatures'.

Last year, she wrote an article blasting the Oxford Union over its handling of an alleged rape scandal, and calling for compulsory 'consent committees' to educate students about sexual etiquette.

She said there was an 'endemic problem of rape culture', adding: 'Understanding consent will shatter the illusion that rapists are strangers and creeps, when around 90 per cent of survivors know their attackers.'

No HeterOx, the gay rights magazine founded and edited by Miss Teriba, courted controversy when it purged a number of white gay men because their political views were insufficiently radical, saying in a statement: 'Zionists are not welcome here.'

A student magazine named Miss Teriba the second coolest person in Oxford in April this year, saying that she 'runs more club nights per week than most people go to in a term'.

After her resignation, the Oxford student union women's campaign criticised Miss Teriba and accused her of 'rape apologism' over her statement.

'Rape apologism manifests in infinite forms,' the campaign said. 'We define it as any discourse that refers to sexual assault as anything other than what it is - unacceptable and appalling abuse.

'The statement recently shared is, unfortunately, rife with apologism and we do not condone it nor the violence it describes.'

The student union at Wadham - which dates back to 1610 and counts Christopher Wren as one of its alumni, but now has a reputation as one of the most Left-wing colleges - said that it would be 'entirely inappropriate' for Miss Teriba to continue as an officer.

The University of Oxford and Wadham College have refused to comment on the furore.

A spokesman for Thames Valley Police said that it was not possible to check whether or not an investigation had been launched into Miss Teriba's claims, but encouraged anyone who thinks they may be a victim of a crime to come forward.