Personnally, I don't like anal myself. However, I have no objection to it being on this site providing the girl is happy to do it.
The important thing for me, as SyrinnXXX has mentioned, is that any real anal clips are clearly signalled which means putting the word anal in the description in the clip selector. This would be useful for both those you wish to find anal clips and those who wish to avoid it.
Also, there should probably be a tag for the card indicating that there are anal clips. In fact, it should probably state how many clips of the total are anal related.
Also, if there is going to be anal, I would prefer that the girl concentrated the anal action heavily in the clips signalled as anal, but to not do any anal action at all in other clips. Half measures is likely to irrite everyone.
For me anal is anti-erotic and would actually reduce my enjoyment of the other action.
The beautiful thing about DB is that you can choose to skip clips you are not interested.
So in conclusion for anal clips, I would ask that:
1) It be all or nothing
2) Anal clips are clearly labelled.