GFE = Girl Friend Experience
That is all it means. Kissing and intimacy is involved. Just like a relationship with a real girlfriend.
Most of us get sick of the non intimate sex that many providers do in the USA, which seems to be very mechanical like having sex with a robot. If you can make our visit with you memorable then that would be a Girl Friend Experience.
You seem to be on the right track after reviewing Tbonetas review.