To me, I think the difference between GFE and PSE is more the attitude, if that makes sense. Like, GFE is more sensual, lots of mutual foreplay, maybe some cuddling between rounds, that sort of thing. PSE is more “sportfucking”. Rough, sweaty, dirty, lots of dirty talk, lots of spit, assorted fluids flying everywhere, maybe the girl does a toy show or something for you. I think it’s less about the specific acts offered and more how they’re performed.
That’s my take, anyway. I’m sure different people have different definitions.