Ask a slut Anonymous - Anal & fisting, when.

Q.
How long should I wait before suggesting anal sex and fisting?

A.
Don’t ask! Make that slut enjoy having her asshole used like i do!

really though, I think the sooner the better.
As with any desire in a relationship, sexual or not, comunication should come first.
Not only because you can both start having much more fun as soon as possible, but also because if she isn’t into it, are you realistically going to persue a long term relationship? This would be the same if she wanted k**s one day and you never did.
If she is not at least open to it, and it is something you know that you can’t live without (and who could?) then i think it is better to know before you get too attached.