There's another recent thread that touches on this, and we agreed that PSE was difficult to define!
My own take is...
GFE = a lot of kissing, stroking, cuddling and 'normal' sex (probably not anal), i.e. vanilla and with the idea of being friendly, warm and intimate
PSE = anal, deepthroat, CIM, facials, ATM etc. and generally rougher, more no holes barred type of thing