well I enjoy it... and no, I don't believe all Dom/Dommes would demand it of their submissives because... well, it's kind of silly to think that all of them would want the exact same thing! just like subs never all want the exact same thing.
I did see in one of the Dom threads though, that anal sex was considered to be one of the most submissive things a sub could offer.
What matters most is whether or not you want to offer anal sex to your Dom/me because if it's a hard limit for you, then your Dom/me shoudln't demand it of you.
Whether or not anal would be used as punishment would depend on the sub I suppose... some hate it but it isn't a hard limit so it could be a punishment then... for me sometimes it's a punishment, depends on the context and how it's delivered because I rather enjoy it.
hope my post helped!