I agree Goosefoot.
I am finally getting around to reading the Guardian article linked by the OP, rather than commenting on "issues in general".
www.theguardian.com/lifeandstyle/2020/apr/18/my-life-in-sex-my-wife-wants-a-desire-free-old-age-but-i-still-see-her-as-my-sexual-partner
There are some things in it that I find rather questionable!
"My wife and I married when we were in our early 20s. We enjoyed our sex life, though I never felt she enjoyed it as much as I did."
Note:
husband seems to regard sex as something that they do separately-together, if you get my drift, ie. that it does not seem to have occurred to him that the nature of his involvement might have some bearing on the fact that he "never felt she enjoyed it as much as I did". Never?? They have been married 40+ years - I think he knows!
"Her menopause began when she was 50. Hot flushes were the main symptoms, accompanied by restless nights, irritability and a declining interest in sex. She decided not to take HRT, mainly because she was anxious about the increased risk of breast cancer. I suspect she was also quite happy to let nature take its course and enjoy a desire-free old age."
Where does he get the idea that taking HRT after menopause re-awakens or jump-starts an enthusiasm for sex and that not taking HRT results in "a desire-free old age"? 
"By the time we were 60, her interest in sex had declined to almost nothing. What I found difficult was her response to my continued enthusiasm. She quite liked a friendly cuddle, but any tendency for my touch to become a caress, or my hands to approach her erogenous zones, would be met with irritation and an abrupt dismissal. She referred to my touch as “tickling”, or worse, as “groping” or “mauling”. If she caught me looking at her when she was dressing or undressing, she would become angry and accuse me of looking at her as a “sex object”.
She has always been a feminist, and I have always supported her views concerning equality of education, opportunities, work and pay for men and women. However, she is also my sexual partner, and therefore the woman I desire, not a sex object."
Given his earlier statement about feeling his wife has never enjoyed sex (ie. with him!) as much as he has enjoyed sex with her in 40+ years of marriage, I struggle with this: " . . . she is also my sexual partner, and therefore the woman I desire, not a sex object"
It really does not sound like there has been a "sexual partnership" and much more that he "desired" her as a "sex object".
This seems more like a transaction than a partnership: support for feminist views in exchange for unenthusiastic and possibly unwilling sex.
I would love to hear her side of the story!
"I have had three short-lived affairs during the last 10 years, which all ended because the women involved refused to “share” me. But how can I possibly abandon my best friend, the mother of my children, co-owner of our family home, sharer of mutual friends? I still love her. I just want a reasonable sex life. Is that an impossible daydream?"
Right now I am hoping that her side of the story features a "fancy man", a lesbian lover and secret stash of fancy vibrators that whizz merrily when he is out of the house 
I wonder what her "impossible daydream" is?
It might be that she knows about his affairs and hopes he will have another one and leave her alone because she regards him as her "best friend, the (father) of my children, co-owner of our family home, sharer of mutual friends"?
At no point does it seem to occur to him that she is not necessarily hoping for a "desire-free old age" and that her rejection of his sexual advances is something that he ought at least to consider might be "personal".
I feel very unsympathetic to his plight from the way he has described things but it is impossible to understand what is going on in that relationship without knowing her side of the story.