My own definition of a GFE would be a slower build-up with FK with mutual foreplay. Different girls have different definitions though. Some of them specify on their profile, eg PSE includes CIM, facial and anal. Some (a lot) of girls advertise GFE, but don't FK. Some prossies will limit the amount of 'fucking time' on a GFE, but not on their higher rate PSE. It's very variable, so it's just best to confirm services and price with the WG when booking, and again before paying.