淫亂

promiscuous

excess / excessive / wanton / lewd / lascivious / obscene / depraved

variant of 淫[yin2]

in confusion or disorder / in a confused state of mind / disorder / upheaval / riot / illicit sexual relations / to throw into disorder / to mix up / indiscriminate / random / arbitrary

group licentiousness (offense punishable by up to five years in prison in the PRC)