can someone explain

What is the difference between pse and gfe?

Depends on the lady.

for me:

GFE = kissing, holding, hugging, intimate chat

PSE = DATO, TUMA, Rusty Trombone, SS.. you get the picture

this is a PSE: http://eccie.net/showthread.php?t=1178137

No, its a deep secret and you have to know both the handshake and the password.

For many about $100