According to Finnis, the key problem with sexual relations or sexual activity that is not aimed at ...

According to Finnis, the key problem with sexual relations or sexual activity that is not
  aimed at producing children is that such activities
 
  a. are forbidden by God.
  b. do not contribute to the good of the larger society.
  c. cannot aim at a common good and therefore cannot express or achieve anything more
  than personal individual bodily gratification.
  d. do not produce genuine pleasure but only the counterfeit of pleasure, a false pleasure
  that is unworthy of the rational and spiritual elements of humans.
  e. are counter to our basic biological nature and its emphasis on procreation and the
  good of the continuing species.