That's sort of a long way of saying that your feelings are normal. The only real difference is that you're facing it now rather than back when you first met. Ask yourself this. If your wife's experience had completely pre-dated you meeting her, would that have affected your decision to marry her? My hunch is that it would not have.
I think this is actually why it hurts - I DID deal with similar feelings when we first started dating, and came to terms with her having many more sexual experience than I had and other related feelings about her life before us. Her and her long term boyfriend had sex every fucking way imaginable, such that it felt like I could never bring anything new to the table. It sucked. Now, here I am dealing with it all over again, and in a much more unfair way.
My wife was not accountable to me while being the person she was before we dated, and I knew that, and it was still difficult to accept some things and let it go. For the A sex, she was accountable to me and did it anyway, knowing how insecure I can be and how much it would hurt me. Of course, she never thought about me at all, but I am hurting none the less.
I think the sex thing for me was also helped me us exploring new things and new experiences together. Doing things you've never done before satisfy the novelty aspect.
I know this sounds corny and cliched, but maybe you can have an A with your W. Plenty of things to do in that space. Discuss things that would be comfortable for you.
Sex was one the last part of relationship to recover. We even had a sexless M for a time for a lot reasons (mostly her). You set some ground rules (like it is ok to stop if triggers become too intense. Also doing because you think you should is a recipe for disaster too.
I have a few thoughts here. First, sex recovered very quickly for us, in fact it never really went away. We had HB early on and while I don't think it's HB anymore, we still have sex around 4-5 times a week. I think the fact that her A was so long ago helped me in not losing my desire for her. Unsurprisingly, our relationship was probably the most sex-starved in the first couple years after her A because of her internal conflicts with it (all unknown to me at the time).
Second, we have gotten more adventurous lately and I do like having things with her that are "mine" completely and unshared by anyone else. I think my wife is up for trying anything I want, but I don't know how much I am interested in the "role playing" side or "reclaiming her" by way of copying the ways she had sex with her AP. I have had this suggested by others, and I just don't think it would work for me. Maybe one day I'll be up to try it.
Finally, what concerns me is that the main "novelty" that I pine for is sex with someone else. I feel like I gave up my youth too fast in pursuit of "true love" and now that the "true love" part is tarnished, I have some anger about not getting to experience more things sexually before settling down.
I only had sex with one other girl, and it was only twice, and both times were drunken and unmemorable (figuratively and literally, as in I can barely remember them). Meanwhile, my wife has had sex with 4 other guys, but had sex hundreds of times with one of them and had many other hookups that got "almost there", not to mention her affair after we both committed to giving up sex with other people.
Now I'm in my mid-30s and any feelings of youth are quickly disappearing, and I honestly find myself coming back to this place of curiosity and wanting to "balance" things, to make it fair, to find justice. I have discussed getting "professional help" such that I would not have an affair and it would happen with my wife's knowledge. It's not about hurting her. If she is hurt a little by it, well then so be it, I've been hurt plenty by her actions too, and mine "wouldn't be about her" just like her A "wasn't about me".
Anyway, I keep going back to that thought and I'm not sure what to do with it. I don't want to have an affair. I also don't want to feel unsatisfied and thinking "what if" my whole life.