and refers to an experience that (idealy) would be similar to what you might find in a porn movie.  The action is a bit more wild and athletic, and there isn't the cuddly and kissy experience that is more the GFE.

Also, often (but not always), it refers to greek (anal).

There is no answer and no definition of what one is versus the other.

Instead of trying to define GFE vs. PSE as a list of acronyms that you can check off or a formula such as PSE = GFE + anal, just read a girl's reviews and get an idea of what she offers.