The "definition" of GFE and GFE+ have been moving targets and discussed for years here and on other sites. Even when some or most use or read it a certain way, others may not.
Does it mean BBFS? To some it may, to others it may not.
Does it mean Greek? To some it may, to others it may not.
Does it mean CIM? To some it may, to others it may not.
And the list goes on and on and on.
Talk to 25 men and 25 women and you will probably find at least 10 different answers from each group.
The only thing that is constant is that GFE+ offers "something more" than the lady's standard services. Exactly what that is can be difficult to pinpoint and will differ with each lady. It all depends on what their definition of GFE is and their experiences that form their perspectives. You'll find the same type of discussion and results when talking about so-called "VIP" services offered by some ladies. Exactly what does that mean?
Obviously, we can all understand that GFE+ means something more than standard GFE service. Exactly what that is can only be up to that individual. Start with what her standard GFE service is and add from there. Unless it is clearly defined by the lady, all the rest of us can do is guess.
I expect that you were hoping for a more clear cut answer, so I apologize for muddy the waters with my response