As to the specific questions.

Quote Originally Posted by subserviant View Post
Much talked about is anal sex i wonder if as many women actualy doit as its talked about .Do all masters demand it from their subs
No, I am not particularly enamoured with anal sex and never require it. That said, I'm very much into it right now because my girl gifted me sole use of her ass. And that appealed to me. Especially as when I take that gift her reaction is unique. She says she feels extremely submissive and used when I take her. And I must admit, it is not only quite heady... but just a little addictive.
and should subs submit even if it does not exactly thill them afterall it is a part of being submissive .
Yes, I think if it (or any body) is not a limit, then it belongs to the dominant to use as he sees fit*
should it be used for punishmnent ?
As I said above, my opinion is never... unless the dominant detests it himself and would never take pleasure from the act of punishing... but that's just me.

* ~'as he sees fit' presuming that is the nature of your D/s relationship. I can imagine different kinds of D/s where there is more "control" retained by the submissive.