Guess it's complex as all aspects of life, but there are other fora. I also check out 2 forums dedicated to racing and
http://www.shecycles.net/index.php which is a dedicated ladies' forum, (men are allowed only if they are sensible, and not full of testosterone fuelled nonsense as i believe the MTB sites can be). Whilst quite a few of the ladies' are MTBers there is a mix of girlies.
So there are lots of ladies cycling just we are spread more thinly across the disciplines. There are of course the various Ladies' Cycling Associations around the country, but they are sadly dying out. Many began in the hey day of cycling in the post war years and whilst they mainly promoted ladies races and had their own internal competitions, they also had other events. I know for a fact the various associations would meet up for a post race season YHA weekend such as Peak district so groups would be able to ride out from Central, Yorks and Manch associations.
After celebrating it's 50 anniversary 3 years ago Yorkshire Ladies assoc has folded this year because younger members were not prepared do the committee work, just hope these same members do not miss the various events and social activities that this supported, or perhaps they should then they will realise what they have lost.
Many of the ladies I come across are actually worried about not being technically minded and would be concerned to be alone if something went wrong with their bike, all the more reason for you fellas out there to ensure your lady knows how to do some basic repairs.
I do see small groups out there but guess they are smaller and fewer inbetween so they are less likely to be spotted over male groups or will be within a group of males.
As for doing other things, well housework etc often gets pushed down the list in favour of cycling.
I often come on here when my son is watching stuff on Tv I am not interested in or when I am supping my tea before going out to work in the morning.
PS I feel another why do ladies cycle/not cyle thread coming on, I guess it is similarly linked.

I stand and rejoice everytime I see a woman ride by on a wheel the picture of free, untrammeled womanhood. HG Wells