Comedian and actor Aziz Ansari has responded to an allegation of sexual assault, saying he thought the encounter was "by all indications completely consensual".

The 34-year-old Master of None creator and star was accused by a 23-year-old woman of allegedly taking advantage of her after they went on a date in September 2017. 

Known by the pseudonym 'Grace', the woman told the website Babe that it was "by far the worst experience with a man I've ever had".

She alleges that when they returned to Ansari's apartment after dinner, he repeatedly tried to initiate sexual activity and did not heed her signals that she did not want to have sex with him.

"I felt violated," she told the website. "It took a really long time for me to validate this as sexual assault."

Ansari responded on Sunday in a statement released through his representative that read: "In September of last year, I met a woman at a party. We exchanged numbers. We texted back and forth and eventually went on a date. We went out to dinner and afterwards we ended up engaging in sexual activity, which by all indications was completely consensual.

"The next day, I got a text from her saying that although 'it may have seemed OK', upon further reflection, she felt uncomfortable. It was true that everything did seem OK to me, so when I heard that it was not the case for her, I was surprised and concerned. I took her words to heart and responded privately after taking the time to process what she had said.

"I continue to support the movement that is happening in our culture ... It is necessary and long overdue."

The woman said she decided to come forward about the encounter after the Golden Globes where Ansari accepted the award for Best Actor in a Musical or Comedy for his show Master of None and wore a Time's Up pin to the ceremony.

'Grace' supplied the website with the texts she sent to Ansari the day after their date. She told him: "Last night might've been fun for you, but it wasn't for me. You ignored clear non-verbal cues; you kept going with advances.

"You had to have noticed I was uncomfortable … nothing [changed] even after I expressed that I'd like to slow it down."

He responded: "I'm so sad to hear this. All I can say is, it would never be my intention to make you or anyone feel the way you described. Clearly, I misread things in the moment and I'm truly sorry."