I ma not familiar with those terms.  I twas used in a review in the context of warming up to the big act.  EX: "She went LFK to DFK and SE and NE before BBBJ"

any specific sexual reference to either of those abreviations.

NE often is short for "any", and SE means a lot of things such as "spousal equivalant".

Here's a link to one of the pages from where you can get to the other.

See if any of these make any sense in the context they are used.

you can always PM the reviewer and ask for their abbreviation to be on the safe side

Northern Exploration / Southern Exploration.