Late last month, the FBI raided and shut down MyRedbook, a website that allowed escorts to advertise their services and negotiate with clients.

Women in the industry relied heavily on MyRedbook to do background checks on their clients. Sex workers would post about instances of violence or circumstances in which they felt unsafe.

Without MyRedbook, prostitutes are having a difficult time vetting their clients.

“It’s like sex workers lost their Yelp,” said Bay Area sex worker and activist “Siouxsie Q.”

Male clients also used the site to review and discuss their experiences.

That’s why call girls say that the further underground sex work goes, the more dangerous it is for everyone involved.