Sentence:  Instead - and <WSD>not</WSD> just to prove my objectivity - I hasten to report that it 's a highly amusing film which probably does a fairly accurate job of reporting on the Easter vacation shenanigans of collegians down in Fort Lauderdale , and that it seems to come to grips quite honestly with the moral problem that most commonly vexes youngsters in this age group - that is to say , sex . 
Meaning of the word marked with <WSD> tags:  negation of a word or group of words