In the course of hitting the nail on the head about sex and aging, Joanna Cake also perfectly outlines why the Unified Field Theory of pop Ev-Psych is so wrong radar won't find it.
If you are in a relationship, Sex and Menopause is a subject which needs to be dealt with as a couple. Many marriages will be affected by the female's surge of testosterone prior to her Menopause which can leave her temperamental and sexually insatiable - and this is particularly noticeable (and often rather annoying) when her man begins to become aware of a gradual lessening of libido at the same age. But it's the mood swings and hot sweats that can really get a girl down. Bad tempered outbursts, hot sweats, lack of sleep, the feeling that we have no identity of our own accompanied by the female equivalent of a raging hard-on. It's not a good mix and is the basis for a female midlife crisis.
Source: Having My Cake and Eating It Too
'Member how EPs always say men "evolve" behavior one way while women "evolve" exactly the opposite? Through entirely different forms of selective pressure based on entirely different optimized reproductive strategies?
Try telling that to a 45-year-old woman who's 55-year-old husband's drinking, smoking, and eating habits have started catching up with him!
For that matter, in my (at least so far!) 2nd- and 3rd-hand experience try telling that to a 55-year-old man who's 45-year-old wife's years of eating right and hitting the gym three times a week have kept her healthy and seems to be "constantly" (i.e. more often than he's comfortable with) hitting him up for sex when mostly he'd rather cuddle or watch TV.
The behavior of older heterosexuals is surprisingly similar to the behavior of teens and 20-year-old college students exhaustively monitored by pop Ev-Psych professors... only with the sexes reversed.
Now if you were to tell me there was a general evolved behavior that humans manifest when they experience more urge to have sex than their partner, or when faced with more pressure to have sex from their partner then I'd say sure, sounds great!
I just don't think you can build a sex-specific evolutionary case that explains how men's and women's behaviors morph, in matching fashion, as we age.