I think women can be quite naive about this really.
Most men who are looking for an equal relationship would choose someone a similar age to have that relationship with.
The sort of men who are interested in an actual partner; who expect and want to play an equal role in raising children and running a household; equality around chores etc.
They generally also want a woman who is their 'best friend'; with whom they have common interests (music, films, cultural and political etc).
They find those women generally attractive because of the way attraction works.
You can't easily have that sort of equality in a relationship with someone 25+ years younger than you because of a lack of shared experiences, cultural references, different life stages, etc.
But just sex? That's a totally different thing and any woman who thinks her husband/partner (or men in general) isn't sexually attracted to much younger women is naive.
With few exceptions, straight men will have sex with women who are willing to have sex with them in the main. If they think that that will 'only' be women of their own age, that's who they'll go for. If they think they've got a chance with someone younger, they'll go for them.
Many men realise they'll just come of as creepy and younger women won't be interested so they stick with what they've got/can get even with her perimenopausal body. Others don't. But they all look and they all react.