IF you read the article you would see the following:

"Once a male user puts in a request, which includes such subtle romanticisms as hours needed and desired price, the inquiry has just 21 minutes to be accepted by a female user in the area before it disappears into the erogenous ether.

If a request is accepted by a female user, the pair then have the opportunity to negotiate a bit on pricing and time before settling to meet offline."

This is were she can ask for screening information, and anything else.  
Yes I would see who it would be crazy to just go in blind,