In our times, some special services still uses women spies in that way. For example, the famous sex spies girls in Russian. A french minester was caught telling some state secrets to such a woman in bedroom time. General DeGaulle was very sarcastic when the minester in question came back...
Usually, it doesn't work that way. For example, a "treatment agent" remarks a man who is in place to gather some data, like a financist. This financist is tested (to check his fiabilty...) and contacted... and several offers are made (money, patriotism, dept erase, pressures like haveing him on picture fucking a sheep, etc...).
In this game, it would make better sense the main protagonist is a "normal" backpacker girl, with a past of promiscuity, observed and tested by an intelligence service which will finally make the mission proposal.
You'll have to have several meetings with your treatment agent, who will monitor the mission and gives you orders. Of course, you're not involved in all the secrets, and special tasks like hacking the cctv system is not done with you (you truly see a full intelligence service, with network specialists, involving a person exterior to the service to do such a delicat task ? no way !)