Former sex worker attacks her "pathetic" clients in an open letter.

A Danish former sex worker has taken aim at her clients, accusing them of being selfish, pathetic, deluded and disgusting.

In Tanja Rahm’s open letter, which first appeared on the Danish website Welt and subsequently in The Daily Telegraph, she details the reality of being a prostitute dealing with customers who are “so mediocre that [they] think that sex is all about ejaculating into a stranger’s vagina.”

After three years as a sex worker in various Danish brothels, these are Tanja’s most surprising confessions.

1. She never orgasmed once with a client, despite often faking it.

Despite what her clients might have believed, Tanja said she never climaxed during her sessions: “I faked it so much, that the receptionist would nearly fall off of her chair laughing. What did you expect? You were perhaps number three, or number five, or eight that day.”

2. She kept working during her period.

Tanja admits to placing a sponge inside her vagina so she could keep working through her period, acting surprised that her period had “just started” if a drop of blood escaped during sex. She would lie and tell her clients she planned to go home after their session, then continued working, telling the same lie again and again.

“You were all so consumed with your own lust that a little menstrual blood did not stop you,” she writes.

3. She hated it when clients brought in sex toys.

Far from the non-judgemental attitude many assume prostitutes take to sex toys and role play, Tanja says she was "disgusted" when one of her clients introduced their "sick fantasies" into their session.

4. She doesn't believe there are any "excuses" when it comes to men visiting prostitutes.

"I did not care that your wife had pelvic pain, and that you just could not go without sex," she writes of the varying excuses of men in committed relationships.

"Or when you offered any other pathetic excuse for coming to buy sex with me.... I had nothing but contempt for you."

Watch: Sara Collins offered to pay for a prostitute for her husband while she suffered from PND. Post continues after video... 

5. There is no such thing as a "nice customer".

"Maybe you think that you did me a favour and gave me a break by talking about the weather, or giving me a little massage before you penetrated me," she writes. But that was not the case at all.

"There are no nice customers. Just those who confirm the women’s negative view of themselves," she concludes.

Read the full letter here.

Tanja's story appears in the the newly released book Prostitution Narratives: Stories of Survival in the Sex Trade (Spinifex Press, 2016) edited by Caroline Norma and Melinda Tankard Reist. Tanja Rahm was prostituted for three years in different Danish brothels and managed to extricate herself from prostitution when she was 23-years-old. She works as a therapist, sexologist and a lecturer. You can buy the book here.