I've been having outcall girls to my home for the last 5 years, and not once have I experienced any security issues. Variable levels of quality in terms of looks/presentation/effort/attitude, sure, but not once have I ever worried about security.
Did once have an agency in Milton Keynes say they would send me a girl who would come up to the room with the driver and he would take the cash and leave her with me.

I dinnae like the sound of that so told them to do one.
Some girls have told me they have a driver waiting in the bar of the hotel or nearby, I think to give them some feeling of security, even if its BS. No problem with the driver being in the bar or car, but
never inside the inner sanctum of puntdom

Despite all that, I prefer outcalls - miles better than incalls IMO