I'm not a doctor, nor did I sat at a Holiday Inn last night, but I'm convinced hormone replacement therapy is essential during and after menopause.
Men can experience the same thing, and may choose to take a testosterone supplement or other therapy, or just take the easy way out with Viagra.
As an example, my wife had a fairly high sex drive throughout her 40's and 50's. She wasn't really a slut after we married, but she had her share of strange cocks over the years, and even experienced her first lesbian sex in her late 40's, and continued (very infrequently) into her 50's.
However, that was also the beginning of the end of her libido. Her interest in sex began to wane, it was harder and took longer to get her properly worked up, and became more like a chore for her. Once menopause happened in her later 50's, it became a rarity. It was like flipping a switch from "hot" to "not".
She chose not to take hormones for whatever reason and now is essentially frigid. She might flash her tits to a friend, or go braless around the house when workers are present, but that's nothing compared to some of her previous exploits. And absolutely no sex with me or anybody else. Not even masturbation.
Contrast that with a friend who is approaching her middle 60's, has gone through menopause, has some HRT, and has an incredible sex drive. She has even lived out some of her wildest fantasies since I've known her. As matter of fact, she had even arranged a 3 way for her, me, and another friend some school days, but fell apart at the last minute (unfortunately).