"I've had someone saying they would rather kill me than Hitler," says 24-year-old Jennie*.

"They said they would strangle me with a belt if they were in a room with me and Hitler. That was so bizarrely violent, just because I won't have sex with trans women."

Jennie is a lesbian woman. She says she is only sexually attracted to women who are biologically female and have vaginas. She therefore only has sex and relationships with women who are biologically female.

Jennie doesn't think this should be controversial, but not everyone agrees. She has been described as transphobic, a genital fetishist, a pervert and a "terf" - a trans exclusionary radical feminist.

"There's a common argument that they try and use that goes 'What if you met a woman in a bar and she's really beautiful and you got on really well and you went home and you discovered that she has a penis? Would you just not be interested?'" says Jennie, who lives in London and works in fashion.

"Yes, because even if someone seems attractive at first you can go off them. I just don't possess the capacity to be sexually attracted to people who are biologically male, regardless of how they identify."

I became aware of this particular issue after I wrote an article about sex, lies and legal consent.

Several people got in touch with me to say there was a "huge problem" for lesbians, who were being pressured to "accept the idea that a penis can be a female sex organ".

I knew this would be a hugely divisive subject, but I wanted to find out how widespread the issue was.

Ultimately, it has been difficult to determine the true scale of the problem because there has been little research on this topic - only one survey to my knowledge. However, those affected have told me the pressure comes from a minority of trans women, as well as activists who are not necessarily trans themselves.

They described being harassed and silenced if they tried to discuss the issue openly. I received online abuse myself when I tried to find interviewees using social media. 

re the link in the quote above: retroactive withdrawal of consent.

For the rest, it's misogyny. Lesbians are biological females who eat pussy