Buddhist attitude towards prostitution and non-procreative sexual activity I would like to ask a question from a Theravada Buddhism perspective.

In the Sutta it's said having sex with particular people is considered as sexual misconduct:

He has no intercourse with girls who are still under the protection of father or mother, brother, sister, or relative; nor with married women, nor female convicts; nor lastly with betrothed girls.

My question is, why prostitute does not include in the prohibited person? Does it mean having sex with prostitute does not considered sexual misconduct?

Second question is, from my understanding for married people having sex with their partner is not an offense but how about having oral sex or sodomy with your own wife or husband? 
Is it true that oral sex and sodomy will make you take rebirth as an animal?
Does it mean having sex with prostitute does not considered sexual
  misconduct?


It does not break the 3rd precept, if both parties are proper(not belonging to the 20 kinds of improper partners). However, not breaking the 3rd precept does not mean you are not committing unwholesome Kamma. All sexual activities are unwholesome regardless of if you are not breaking the 3rd precept. Because the root causes are always lust and delusion. 

The five precepts are given as the minimal moral standard that is required for spiritual development. A person who keeps to the 5 precepts can still commit many unwholesome Kammas. But doing it with your spouse can potentially be less unwholesome compared to doing it with a prostitute. Because the relationship with your spouse can involve wholesome feelings as well. With your spouse you are not trying to have pleasure regardless of if she/he is enjoying it. You are usually more gentle and if she/he isn't ready or finds a certain method uncomfortable, you get to practice self restraint. That comes from Metta &amp; Karuna. So it's not all lust. But with a prostitute, you are mostly trying to get your money's worth. Usually you don't care much for the other person. The focus is on extracting the maximum enjoyment you can, in whichever way you so desire during the time you get. The lust involved here can be much more stronger. So it can cause greater unwholesome Kamma. Also, there are other disadvantages to consider like your reputation being sullied and the higher possibility of catching STDs.


  Is it true that oral sex and sodomy will make you take rebirth as an
  animal?


Any kind of sexual activity has the potential to give you a unfavorable birth, if it comes forward at the time of your death. Read more about how the mind works at the of death. However, engaging in unorthodox sexual activities usually requires a greater degree of lust and delusion. So the said methods can potentially cause stronger unwholesome Kamma.