What about nature, specifically?

I tend to think it’s nurture (societal mores), and not nature, which leads to this assumption.
Not to disregard your experiences, as I’m sure they are true and therefore valid in shaping your opinion, but I think anecdotal evidence can be employed to argue many different conclusions. I for one know of women whose sex drives have diminished greatly, as have you, so I would certainly agree these cases exist. However I also know of post-menopausal women who experience a newfound anticipation toward their sexuality because they no longer fear a pregnancy. I also know of post-menopausal women who continue to feel sexual desire toward their husbands and become very concerned when their husbands’ physiological changes cause a decrease in their intimate lives. (There’s a reason Viagra is a multi-billion dollar industry)
(Not that I go around asking women about their sex lives - I’m just familiar with quite a few situations because I’m involved in the health care field

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I’m not sure I understand the last sentence - there has been a dramatic
increase in female promiscuity over the past 50 decades precisely because contraception has allowed women to separate sex from procreation.
Oh-my-gosh-I-can’t-believe-you-just-said-that!!!
(Not attempting to make light of the Church’s teaching on masturbation, but just to underscore your point - women face these same struggles, and the reason we don’t read about it is because of the perceived shame/embarassment many of them feel. Even in today’s permissive society, any company that advertises female sex toys will strongly emphasize “anonymous shipping” and “discreet packaging”.)
Women as well as men can benefit from healthy Catholic teaching and advice pertaining to sexual desire, but it is a teaching that needs to address the real and fundamental struggles they face, not only how it relates to their future husbands and procreation.
Indeed. Despite the fact that we have very few historical texts written from a female sexual perspective, there’s a reason only eunuchs were employed in harems, and phallic sex toys have been mentioned in the earliest of writings. It was during Victorian times (when “ladies” were not supposed to enjoy sex) that the vibrator was invented as a way to relieve the workload of physicians who had to cure case after case of female “hysteria”. “Hysteria” referring to the extreme moodiness, anxiety, and ill-temperament that drove women to seek out medical assistance. As the treatment of choice was “hysterical paroxysm”, which was indeed an orgasm (though it was conducted in a very clinical and non-sexual way), it’s now understood that the cause of hysteria was sexual deprivation. I think it’s sad that instead of encouraging healthy intimate relations between husbands and wives, female desire was seen as a
problem that needed to be cured or controlled, while it was perfectly acceptable for any man of means to secure a mistress.
Interesting. . . . so much focus on controlling and influencing a woman’s sexual appetite when (according to popular consensus) it’s supposedly of such low and inconsequential levels to begin with.