I have a client texting and saying "I'd prefer more of a PSE than a GFE if that's OK."
I consider my service a Girlfriend Experence - I'm affectionate and friendly and moderately vanilla (yes, I'll do anal, OWO and CIM).
I assume a PSE is more extreme and involves facials, deep throat, and gagging? None of those are things I do although no judgement on those who do. (I wish I could deep throat and my only problem with facials is the stuff ends up in my eyes or my hair or someplace like that.)