Amazon: 
http://amzn.to/24qwLow Continuing this run of Heinlein. 
 In this one we feel the full force of Heinlein’s orthogonal views. Lots of sex and taboo breaking. More than a little uncomfortable at times. 
 Vulnerable to interpretation as the ramblings of a dirty old man.
 Question: ‘Does author mean that today’s amoral is future’s normal?’
  Answer: Yes.