Is it possible to call an escort for sex?

No!  Escorts provide exclusively escort services with additional services that are negotiated when calling a girl, in addition to sexual services. But it is possible that if there is mutual sympathy with a girl, things may come to a blow.
 The site administration asks to report - if girls posting profiles on our website offer or force sexual services on you. When reporting an incident, we strongly ask you to attach screenshots of correspondence or an audio recording of your conversation with the girl to your complaint.
When identifying girls offering services of a sexual nature - profiles of prostitutes will be blocked. 
 You can report an incident using the link feedback located in the bottom section of all pages of the site.