lasciviousness       
noun [ U ] uk/ləˈsɪv.i.əs.nəs/ us/ləˈsɪv.i.əs.nəs/
 淫荡,好色
behaviour that expresses a strong desire for sexual activity
  He looked at her with lasciviousness. 他看着她,眼神中充满了淫荡。 
 See: lascivious
 - More examples
 - To this crowd, his lasciviousness did not seem to give offense.
 - There is a great deal of lasciviousness that goes on.
 - A slow fuse of lasciviousness smouldered in every phrase.
 - Her mouth had the tempting lasciviousness he'd dreamed about so often.