Don't say anything, vanilla people do not understand unconventional sexuality. If you tell her it could be a major source of contention between you and your wife.
I have been married heterosexually for almost 5 years. Through this time I have found some social anxieties and fears that I have been over coming little by little. Now I am finding that I could possibly be classified as Bi-curious. I do enjoy anal/prostate stimulation but am very nervous and afraid of my wife's reaction to this. I have talked to her about it. She says she finds it weird and seems to be uncomfortable with the idea.
I'm just really afraid of her reaction if I try to get her to try anything out.
You're on the right course with communication with your wife. As she tries to understand your point of view, try to understand hers. Love conquers a lot.