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Here's what I found.
Women can fit on men bicycle (the majority of "women" bicycles are the same as the men).
The keys issues is poor design, as the frame sizing isn't consistent, like Specialized, whose smallest frame isn't as short as their medium frame.
That's usually why Cervelo is popular with both genders, despite them not offering a "women" version, because their sizing is much more in relation to the fit.
I believe women tend to have LONGER legs and SHORTER upper bodies relative to their height compare to men? (but men on average will have larger feet relative to their height)?
I'm quite happy on men's bikes, but once you go below a 50cm TT a 700C wheel becomes hard to use with non-toe-murdering geo, and that doesn't make it easy, so now 650C bikes are offered by Evans, among others.
Pink and flowers on women's frames are deffo my big fit issues... :P