Re: you did it for other men, but not me?
I know next to nothing about my wife's sexual past, and only slightly more about her romantic past. I've never asked and I don't want to know -- for this reason. Now that I think about it, I knew about previous girlfriend's pasts, so perhaps I saw the possible future early on.
Our lives are different from when we were dating, and I'm sure they will be different again in the future. But if I knew what the OP knows, I think it would bother me, and I'm a bit surprised women are upset even at the question.
"Love of my life, I have always wanted to try anal. I know you have done it in the past and enjoyed it. We don't have to make it a recurring thing, but I'd really like to experience it. Will you please do it with me?"
Is it unreasonable to ask for an explanation if the answer is "No"?