有色無膽 [－－无胆]

Jyutping jau5 sik1 mou4 daam2
Pinyin yǒu sè wú dǎn

Definitions (CC-CEDICT)
  1. to be perverse and suggestive towards the opposite sex, but shrinking back when provoked to act on it
  2. to have perverted thoughts but no guts to actually do it
  3. to be all talk and no action