Definition of sex pest in US English:

sex pest

noun

British
informal
  • A person who sexually harasses or assaults another person.

    ‘a drunken sex pest who subjected two women to a torrent of abuse’
    lecherous man, libertine, womanizer, seducer, adulterer, debauchee, rake, roué, profligate, wanton, loose-liver, sensualist, sybarite, voluptuary, don juan, casanova, lothario, romeo
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