有色无胆 (有色無膽) yǒusè wú dǎn

yǒusè wú dǎn set phrase to be perverse and suggestive towards the opposite sex, but shrinking back when provoked to act on it; to have perverted thoughts but no guts to actually do it
Domain: Modern Chinese 现代汉语
Notes: (CC-CEDICT '有色無膽')