It is like a cross between the car-ordering service app Uber and the dating app Tinder. Clients log into the app and type in what they want: body type, eye color, personality traits, and the maximum price they are willing to pay.
Pia Poppenreiter, the creator of the app, says she wanted to create a tool that prevented sex workers from waiting in the cold to find clients. Poppenreiter says she pre-interviews people who wish to use the app to make sure they are working voluntarily and independently in the business.
"We have a short conversation to get the feeling that this is voluntary and they are independent sex workers," she said. "We try to ask them -- you kind of find out in a conversation whether they're doing it on a voluntary basis -- we ask them what they did before, whether they've always worked voluntarily and so on."
Unlike many other countries, prostitution is legal in Germany.
Notable deaths of 2014 [PHOTOS]