Brooks makes their 'women's' saddles shorter, which sure doesn't work for me either.
I ride their widest saddle- the B68, but in the 'men's' versions, which is 'normal' length. It's wide whether it's the men's or women's version.
Thus, I think it's more accurate to just refer to the width and shape of saddles, because saddles are not neatly split into Men's and Women's.

Some women have WIDE sitbones and have never had children, and some friends of mine have had several children yet they have very narrow pelvises and need narrow saddles.
It's mostly about your genetics and bone structure. When pregnant, our bodies do produce more Relaxin- a natural hormone which makes connective tissue and ligaments in the pelvis more flexible, so the pelvis can actually spread a bit during childbirth. That doesn't mean you have wider sitbones after having children, but it means the joints in the pelvis can move more during pregnancy to accommodate a baby's head passing through. After pregnancy we supposedly go back to normal Relaxin levels and the effect fades.