Looking at the dictionary definition, well I think it agrees with me - Its says:
Quote:
Definition of 'sexpert'
sexpert
in British English
(ˈsɛkspɜːt IPA Pronunciation Guide)
NOUN
informal
a person who professes a knowledge of sexual matters
Collins English Dictionary. Copyright © HarperCollins Publishers
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So I look up 'professes' and get:
Quote:
profess
1. VERB
If you profess to do or have something, you claim that you do it or have it, often when you do not.
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Which was pretty much what I thought...