Most women dont like it. She might try it as a change or being curious but to love it this is another level. You cant do much except to try it at least for once and then if she says no then i dont think you can do much. Now if she likes it or being a submissive wife then you can try more. For my wife it was a big no first but seeing bulls asking for anal all the time and because she wants to make them happy she started to accept that. As she says always " relax and take it slow, it will hurt first few minutes but then orgasms will hit and you will forget everything else".