颠鸾倒凤
diān​luán​dǎo​fèng

to have sex

  1. 颠 顛 diān verb
    to invert
    to turn upside down; to put in reverse order; to confuse or muddle up
  2. 鸾 鸞 luán
    mythical bird
    A mythical bird in Chinese legends, often described as red and resembling a phoenix.
  3. 倒 dào verbnoun
    inverted
    upside down; reversed; in reverse order
  4. 凤 鳳 fèng noun
    phoenix
    A mythical bird in Chinese legends; specifically the male of the species in 凤凰 fèng​huáng