Pansexualism is a hypothesis in psychology "that regards all desire and interest as derived from [the] sex instinct"[1] or, in other words, "that the sex instinct plays the primary part in all human activity, mental and physical" The above definition is one that stemmed from a misunderstanding of Freud's views on the role sexuality played in the formation of neuroses.
His views were misunderstood and criticized, with others accusing him of pansexualism.
it is a mistake to accuse psycho-analysis of 'pan-sexualism' and to allege that it drives all mental occurrences from sexuality and traces them all back to it.
[2][3] Indeed, in the preface to the fourth edition of his Three Essays on the Theory of Sexuality, Freud wrote, "People have gone so far in their search for high-sounding catchwords as to talk of the 'pan-sexualism’ of psycho-analysis and to raise the senseless charge against it of explaining ‘everything’ by sex.
"[4] The thinker Johann Christoph Friedrich von Schiller used the term to explain the aesthetic and sensual civilization that reconciled sensuality with reason.