Wow, you learn something new every day - had never heard of KSE before, one more for the bucket list once I've got a bit more advanced in my yoga classes anyway! Looks like lots of core strength and flexibility will come in handy.
I generally prefer GFE but it's more my dream girlfriend rather than the type I'm likely to actually get. What I like to call the MGFIADSE. Or the "my Girlfriend is a dirty slut experience".
Like to start slow and sensual, lots of DFK, get more passionate, then get downright dirty. Just depends on the lady how dirty we end up getting. To me A levels are when you start to cross the line into PSE. But even then I've had really dirty sessions with lovely ladies who did a great GFE that included A Levels and rimming on me which is about as dirty as I like it - still didn't feel like a PSE.
I've only ever had one "pure" PSE which was with the delectable Madlin Moon. It was pretty darned awesome just because I'm a fan but at the same time it was also just a touch clinical - ie just one position after another, no real feeling of connection or passion. Don't get me wrong, a great memory and one off the bucket list but not something I would look for in a session usually.