NotTheManIWas,
Heads up to anyone else - this has some information that you might feel is too much for you to read. Just a caution.
I am 58, a female, and a BS. The dynamics of my situation are a bit different in that I was the spouse cheated on and my husband had an EA with his old HS girlfriend. Yeah, that HS love stuff seems to stick around for a long time. Anyway, here is my very honest answer to your question.
First of all, men and women are two very different creatures as you know. For women, after the initial revved up sex from a new relationship, it takes more to get us going - more foreplay, more connecting emotionally, etc.
At around age 50, I began experiencing issues with dryness and sex became painful. I still had a fair amount of libido but it took a little more foreplay to jump start my motor and I needed lubrication. That was based on the physical changes I was experiencing and also simply because at that point, my H and I had been married 17 years and in all honesty sex had become a little mundane. But, I was still willing even though it was painful for me initially. Also, I absolutely could not STAND for him to touch my vaginal area unless it was lubricated - otherwise it felt like sandpaper on skin.
Around age 53 the lack of lubrication became worse. I couldn't generate much, if any, natural lubrication. Sex continued to be painful and for a period of time was worse. I was taking Progesterone that seemed to help somewhat but overall, intercourse was not a pleasant experience for me. And part of it was still the long-married familiarity issue. Unless a couple really works at it I think we all tend to get into a sexual rut. Our intimacy tapered off: 1. Because my H said he was being a "nice guy" and not forcing me and 2. Because it was painful for me and honestly, it had become so mundane it just really didn't do much for me anymore. It became something I endured to please him. I tried really hard not to let that show but ultimately he would end up saying he knew I was only doing it for him. He was right.
Sex means EVERYTHING to my husband. I think like most men it is a measure of how they are loved, wanted, etc. When he wasn't getting as much as he wanted from me and the old girlfriend popped up, well how about that? If they had been in the same city he absolutely would have had a PA. The EA only went on for 3 weeks before I figured out what he was doing, confronted him, and he dropped her like a hot potato.
When the shit hit the fan, we went through the typical HB and I guess all the rage fueled my hormones because I was able to naturally lubricate then. But, as I knew it most certainly would after HB, dryness and boredom became an issue again and remains an issue during intimacy with my husband.
For the longest time I thought I had an issue with my libido. I think I probably do in a way but it's not the serious issue I thought it was. I literally thought my libido was dead. I had no interest in sex. I was trying to write it off to menopause, stress, etc. and there certainly is a portion of that that are issues. I'm not exactly thrilled to climb into a bed when not only is the sex painful and less than fulfilling but also when it's with a man that disrespected me so badly by cheating on me.
Here is the part that is probably going to hurt you and I'm sorry but I think you want honest answers. I've come to realize that the truth of the issue is driven by the fact that I just don't care about having sex with my husband. I still find him attractive and I could endure the physical pain of it if the sex was fulfilling but it's not. It used to be but it hasn't been for years and I just don't care about it. I continue to endure it for him but it's certainly not as frequently as he'd like.
I recognize that much of the issue of lubrication and lack of libido is driven by a true lack of interest in sex with my husband. I figured that out simply because I found myself extremely turned on by watching a major league ball player during a game. I was absolutely stunned at the level of arousal I felt for months after that and I had almost no issue with lubrication. Even now, if I let my mind wander there I will become incredibly aroused. Dear God, I can't believe I even just admitted that on a public forum. But, I really want to help you so I will suffer the humiliation.
I can't tell you what drives your wife but I will tell you that there certainly are menopausal factors that play into lubrication and libido issues. There are also issues with bedroom boredom, familiarity that happens in long-term marriage, anger, resentment, shame, etc. Each of those by itself or coupled with any of the others can lead to a lot of dissatisfaction with intimacy.
If you and your wife want to have an enjoyable sex life it's going to take work. Even then, I can't promise you that lubrication and arousal issues are going to disappear. She is in her late 50's and the damned female body really turns on itself as it begins to get older. But, if the two of you are truly interested in restoring some passion into your sex life I think it can be done. But, you BOTH have to want that. Speak honestly with your wife and get the answers you need.
And now that I have sufficiently humiliated myself by bearing my soul here, I'm slinking off. I'm pretty certain if my husband ever read this I'd be moving over to the divorce forum. He would be pissed not only to read my true feelings but that I would put it out there in an open forum. Of course, most of us have never met but to him it would be like I told everyone we knew.
I hope what I've written helps you.